Commit | Line | Data |
---|---|---|
dde5845a | 1 | /* |
229695e5 | 2 | * HID support for Linux |
dde5845a JK |
3 | * |
4 | * Copyright (c) 1999 Andreas Gal | |
5 | * Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz> | |
6 | * Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc | |
6b1968d5 | 7 | * Copyright (c) 2006-2012 Jiri Kosina |
dde5845a JK |
8 | */ |
9 | ||
10 | /* | |
11 | * This program is free software; you can redistribute it and/or modify it | |
12 | * under the terms of the GNU General Public License as published by the Free | |
13 | * Software Foundation; either version 2 of the License, or (at your option) | |
14 | * any later version. | |
15 | */ | |
16 | ||
4291ee30 JP |
17 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
18 | ||
dde5845a JK |
19 | #include <linux/module.h> |
20 | #include <linux/slab.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/kernel.h> | |
dde5845a JK |
23 | #include <linux/list.h> |
24 | #include <linux/mm.h> | |
dde5845a JK |
25 | #include <linux/spinlock.h> |
26 | #include <asm/unaligned.h> | |
27 | #include <asm/byteorder.h> | |
28 | #include <linux/input.h> | |
29 | #include <linux/wait.h> | |
47a80edb | 30 | #include <linux/vmalloc.h> |
c4124c9b | 31 | #include <linux/sched.h> |
4ea54542 | 32 | #include <linux/semaphore.h> |
dde5845a | 33 | |
dde5845a JK |
34 | #include <linux/hid.h> |
35 | #include <linux/hiddev.h> | |
c080d89a | 36 | #include <linux/hid-debug.h> |
86166b7b | 37 | #include <linux/hidraw.h> |
dde5845a | 38 | |
5f22a799 JS |
39 | #include "hid-ids.h" |
40 | ||
dde5845a JK |
41 | /* |
42 | * Version Information | |
43 | */ | |
44 | ||
53149801 | 45 | #define DRIVER_DESC "HID core driver" |
dde5845a | 46 | |
58037eb9 | 47 | int hid_debug = 0; |
377e10fb | 48 | module_param_named(debug, hid_debug, int, 0600); |
cd667ce2 | 49 | MODULE_PARM_DESC(debug, "toggle HID debugging messages"); |
58037eb9 | 50 | EXPORT_SYMBOL_GPL(hid_debug); |
58037eb9 | 51 | |
6b1968d5 JK |
52 | static int hid_ignore_special_drivers = 0; |
53 | module_param_named(ignore_special_drivers, hid_ignore_special_drivers, int, 0600); | |
643727a9 | 54 | MODULE_PARM_DESC(ignore_special_drivers, "Ignore any special drivers and handle all devices by generic driver"); |
6b1968d5 | 55 | |
dde5845a JK |
56 | /* |
57 | * Register a new report for a device. | |
58 | */ | |
59 | ||
90a006ab | 60 | struct hid_report *hid_register_report(struct hid_device *device, unsigned type, unsigned id) |
dde5845a JK |
61 | { |
62 | struct hid_report_enum *report_enum = device->report_enum + type; | |
63 | struct hid_report *report; | |
64 | ||
43622021 KC |
65 | if (id >= HID_MAX_IDS) |
66 | return NULL; | |
dde5845a JK |
67 | if (report_enum->report_id_hash[id]) |
68 | return report_enum->report_id_hash[id]; | |
69 | ||
a3789a17 JP |
70 | report = kzalloc(sizeof(struct hid_report), GFP_KERNEL); |
71 | if (!report) | |
dde5845a JK |
72 | return NULL; |
73 | ||
74 | if (id != 0) | |
75 | report_enum->numbered = 1; | |
76 | ||
77 | report->id = id; | |
78 | report->type = type; | |
79 | report->size = 0; | |
80 | report->device = device; | |
81 | report_enum->report_id_hash[id] = report; | |
82 | ||
83 | list_add_tail(&report->list, &report_enum->report_list); | |
84 | ||
85 | return report; | |
86 | } | |
90a006ab | 87 | EXPORT_SYMBOL_GPL(hid_register_report); |
dde5845a JK |
88 | |
89 | /* | |
90 | * Register a new field for this report. | |
91 | */ | |
92 | ||
93 | static struct hid_field *hid_register_field(struct hid_report *report, unsigned usages, unsigned values) | |
94 | { | |
95 | struct hid_field *field; | |
96 | ||
97 | if (report->maxfield == HID_MAX_FIELDS) { | |
8c3d52fc | 98 | hid_err(report->device, "too many fields in report\n"); |
dde5845a JK |
99 | return NULL; |
100 | } | |
101 | ||
a3789a17 JP |
102 | field = kzalloc((sizeof(struct hid_field) + |
103 | usages * sizeof(struct hid_usage) + | |
104 | values * sizeof(unsigned)), GFP_KERNEL); | |
105 | if (!field) | |
106 | return NULL; | |
dde5845a JK |
107 | |
108 | field->index = report->maxfield++; | |
109 | report->field[field->index] = field; | |
110 | field->usage = (struct hid_usage *)(field + 1); | |
282bfd4c | 111 | field->value = (s32 *)(field->usage + usages); |
dde5845a JK |
112 | field->report = report; |
113 | ||
114 | return field; | |
115 | } | |
116 | ||
117 | /* | |
118 | * Open a collection. The type/usage is pushed on the stack. | |
119 | */ | |
120 | ||
121 | static int open_collection(struct hid_parser *parser, unsigned type) | |
122 | { | |
123 | struct hid_collection *collection; | |
124 | unsigned usage; | |
125 | ||
126 | usage = parser->local.usage[0]; | |
127 | ||
128 | if (parser->collection_stack_ptr == HID_COLLECTION_STACK_SIZE) { | |
8c3d52fc | 129 | hid_err(parser->device, "collection stack overflow\n"); |
a6fbaacf | 130 | return -EINVAL; |
dde5845a JK |
131 | } |
132 | ||
133 | if (parser->device->maxcollection == parser->device->collection_size) { | |
134 | collection = kmalloc(sizeof(struct hid_collection) * | |
135 | parser->device->collection_size * 2, GFP_KERNEL); | |
136 | if (collection == NULL) { | |
8c3d52fc | 137 | hid_err(parser->device, "failed to reallocate collection array\n"); |
a6fbaacf | 138 | return -ENOMEM; |
dde5845a JK |
139 | } |
140 | memcpy(collection, parser->device->collection, | |
141 | sizeof(struct hid_collection) * | |
142 | parser->device->collection_size); | |
143 | memset(collection + parser->device->collection_size, 0, | |
144 | sizeof(struct hid_collection) * | |
145 | parser->device->collection_size); | |
146 | kfree(parser->device->collection); | |
147 | parser->device->collection = collection; | |
148 | parser->device->collection_size *= 2; | |
149 | } | |
150 | ||
151 | parser->collection_stack[parser->collection_stack_ptr++] = | |
152 | parser->device->maxcollection; | |
153 | ||
154 | collection = parser->device->collection + | |
155 | parser->device->maxcollection++; | |
156 | collection->type = type; | |
157 | collection->usage = usage; | |
158 | collection->level = parser->collection_stack_ptr - 1; | |
159 | ||
160 | if (type == HID_COLLECTION_APPLICATION) | |
161 | parser->device->maxapplication++; | |
162 | ||
163 | return 0; | |
164 | } | |
165 | ||
166 | /* | |
167 | * Close a collection. | |
168 | */ | |
169 | ||
170 | static int close_collection(struct hid_parser *parser) | |
171 | { | |
172 | if (!parser->collection_stack_ptr) { | |
8c3d52fc | 173 | hid_err(parser->device, "collection stack underflow\n"); |
a6fbaacf | 174 | return -EINVAL; |
dde5845a JK |
175 | } |
176 | parser->collection_stack_ptr--; | |
177 | return 0; | |
178 | } | |
179 | ||
180 | /* | |
181 | * Climb up the stack, search for the specified collection type | |
182 | * and return the usage. | |
183 | */ | |
184 | ||
185 | static unsigned hid_lookup_collection(struct hid_parser *parser, unsigned type) | |
186 | { | |
504499f2 | 187 | struct hid_collection *collection = parser->device->collection; |
dde5845a | 188 | int n; |
504499f2 JP |
189 | |
190 | for (n = parser->collection_stack_ptr - 1; n >= 0; n--) { | |
191 | unsigned index = parser->collection_stack[n]; | |
192 | if (collection[index].type == type) | |
193 | return collection[index].usage; | |
194 | } | |
dde5845a JK |
195 | return 0; /* we know nothing about this usage type */ |
196 | } | |
197 | ||
198 | /* | |
199 | * Add a usage to the temporary parser table. | |
200 | */ | |
201 | ||
202 | static int hid_add_usage(struct hid_parser *parser, unsigned usage) | |
203 | { | |
204 | if (parser->local.usage_index >= HID_MAX_USAGES) { | |
8c3d52fc | 205 | hid_err(parser->device, "usage index exceeded\n"); |
dde5845a JK |
206 | return -1; |
207 | } | |
208 | parser->local.usage[parser->local.usage_index] = usage; | |
209 | parser->local.collection_index[parser->local.usage_index] = | |
210 | parser->collection_stack_ptr ? | |
211 | parser->collection_stack[parser->collection_stack_ptr - 1] : 0; | |
212 | parser->local.usage_index++; | |
213 | return 0; | |
214 | } | |
215 | ||
216 | /* | |
217 | * Register a new field for this report. | |
218 | */ | |
219 | ||
220 | static int hid_add_field(struct hid_parser *parser, unsigned report_type, unsigned flags) | |
221 | { | |
222 | struct hid_report *report; | |
223 | struct hid_field *field; | |
cc6b54aa | 224 | unsigned usages; |
dde5845a | 225 | unsigned offset; |
cc6b54aa | 226 | unsigned i; |
dde5845a | 227 | |
a3789a17 JP |
228 | report = hid_register_report(parser->device, report_type, parser->global.report_id); |
229 | if (!report) { | |
8c3d52fc | 230 | hid_err(parser->device, "hid_register_report failed\n"); |
dde5845a JK |
231 | return -1; |
232 | } | |
233 | ||
bb2e1976 | 234 | /* Handle both signed and unsigned cases properly */ |
0cd516c2 | 235 | if ((parser->global.logical_minimum < 0 && |
236 | parser->global.logical_maximum < | |
237 | parser->global.logical_minimum) || | |
238 | (parser->global.logical_minimum >= 0 && | |
239 | (__u32)parser->global.logical_maximum < | |
240 | (__u32)parser->global.logical_minimum)) { | |
241 | dbg_hid("logical range invalid 0x%x 0x%x\n", | |
242 | parser->global.logical_minimum, | |
243 | parser->global.logical_maximum); | |
dde5845a JK |
244 | return -1; |
245 | } | |
246 | ||
247 | offset = report->size; | |
248 | report->size += parser->global.report_size * parser->global.report_count; | |
249 | ||
250 | if (!parser->local.usage_index) /* Ignore padding fields */ | |
251 | return 0; | |
252 | ||
cc6b54aa BT |
253 | usages = max_t(unsigned, parser->local.usage_index, |
254 | parser->global.report_count); | |
dde5845a | 255 | |
a3789a17 JP |
256 | field = hid_register_field(report, usages, parser->global.report_count); |
257 | if (!field) | |
dde5845a JK |
258 | return 0; |
259 | ||
260 | field->physical = hid_lookup_collection(parser, HID_COLLECTION_PHYSICAL); | |
261 | field->logical = hid_lookup_collection(parser, HID_COLLECTION_LOGICAL); | |
262 | field->application = hid_lookup_collection(parser, HID_COLLECTION_APPLICATION); | |
263 | ||
264 | for (i = 0; i < usages; i++) { | |
cc6b54aa | 265 | unsigned j = i; |
dde5845a JK |
266 | /* Duplicate the last usage we parsed if we have excess values */ |
267 | if (i >= parser->local.usage_index) | |
268 | j = parser->local.usage_index - 1; | |
269 | field->usage[i].hid = parser->local.usage[j]; | |
270 | field->usage[i].collection_index = | |
271 | parser->local.collection_index[j]; | |
cc6b54aa | 272 | field->usage[i].usage_index = i; |
dde5845a JK |
273 | } |
274 | ||
275 | field->maxusage = usages; | |
276 | field->flags = flags; | |
277 | field->report_offset = offset; | |
278 | field->report_type = report_type; | |
279 | field->report_size = parser->global.report_size; | |
280 | field->report_count = parser->global.report_count; | |
281 | field->logical_minimum = parser->global.logical_minimum; | |
282 | field->logical_maximum = parser->global.logical_maximum; | |
283 | field->physical_minimum = parser->global.physical_minimum; | |
284 | field->physical_maximum = parser->global.physical_maximum; | |
285 | field->unit_exponent = parser->global.unit_exponent; | |
286 | field->unit = parser->global.unit; | |
287 | ||
288 | return 0; | |
289 | } | |
290 | ||
291 | /* | |
292 | * Read data value from item. | |
293 | */ | |
294 | ||
295 | static u32 item_udata(struct hid_item *item) | |
296 | { | |
297 | switch (item->size) { | |
880d29f1 JS |
298 | case 1: return item->data.u8; |
299 | case 2: return item->data.u16; | |
300 | case 4: return item->data.u32; | |
dde5845a JK |
301 | } |
302 | return 0; | |
303 | } | |
304 | ||
305 | static s32 item_sdata(struct hid_item *item) | |
306 | { | |
307 | switch (item->size) { | |
880d29f1 JS |
308 | case 1: return item->data.s8; |
309 | case 2: return item->data.s16; | |
310 | case 4: return item->data.s32; | |
dde5845a JK |
311 | } |
312 | return 0; | |
313 | } | |
314 | ||
315 | /* | |
316 | * Process a global item. | |
317 | */ | |
318 | ||
319 | static int hid_parser_global(struct hid_parser *parser, struct hid_item *item) | |
320 | { | |
ad0e669b | 321 | __s32 raw_value; |
dde5845a | 322 | switch (item->tag) { |
880d29f1 | 323 | case HID_GLOBAL_ITEM_TAG_PUSH: |
dde5845a | 324 | |
880d29f1 | 325 | if (parser->global_stack_ptr == HID_GLOBAL_STACK_SIZE) { |
8c3d52fc | 326 | hid_err(parser->device, "global environment stack overflow\n"); |
880d29f1 JS |
327 | return -1; |
328 | } | |
dde5845a | 329 | |
880d29f1 JS |
330 | memcpy(parser->global_stack + parser->global_stack_ptr++, |
331 | &parser->global, sizeof(struct hid_global)); | |
332 | return 0; | |
dde5845a | 333 | |
880d29f1 | 334 | case HID_GLOBAL_ITEM_TAG_POP: |
dde5845a | 335 | |
880d29f1 | 336 | if (!parser->global_stack_ptr) { |
8c3d52fc | 337 | hid_err(parser->device, "global environment stack underflow\n"); |
880d29f1 JS |
338 | return -1; |
339 | } | |
dde5845a | 340 | |
880d29f1 JS |
341 | memcpy(&parser->global, parser->global_stack + |
342 | --parser->global_stack_ptr, sizeof(struct hid_global)); | |
343 | return 0; | |
dde5845a | 344 | |
880d29f1 JS |
345 | case HID_GLOBAL_ITEM_TAG_USAGE_PAGE: |
346 | parser->global.usage_page = item_udata(item); | |
347 | return 0; | |
dde5845a | 348 | |
880d29f1 JS |
349 | case HID_GLOBAL_ITEM_TAG_LOGICAL_MINIMUM: |
350 | parser->global.logical_minimum = item_sdata(item); | |
351 | return 0; | |
dde5845a | 352 | |
880d29f1 JS |
353 | case HID_GLOBAL_ITEM_TAG_LOGICAL_MAXIMUM: |
354 | if (parser->global.logical_minimum < 0) | |
355 | parser->global.logical_maximum = item_sdata(item); | |
356 | else | |
357 | parser->global.logical_maximum = item_udata(item); | |
358 | return 0; | |
dde5845a | 359 | |
880d29f1 JS |
360 | case HID_GLOBAL_ITEM_TAG_PHYSICAL_MINIMUM: |
361 | parser->global.physical_minimum = item_sdata(item); | |
362 | return 0; | |
dde5845a | 363 | |
880d29f1 JS |
364 | case HID_GLOBAL_ITEM_TAG_PHYSICAL_MAXIMUM: |
365 | if (parser->global.physical_minimum < 0) | |
366 | parser->global.physical_maximum = item_sdata(item); | |
367 | else | |
368 | parser->global.physical_maximum = item_udata(item); | |
369 | return 0; | |
dde5845a | 370 | |
880d29f1 | 371 | case HID_GLOBAL_ITEM_TAG_UNIT_EXPONENT: |
ad0e669b NK |
372 | /* Many devices provide unit exponent as a two's complement |
373 | * nibble due to the common misunderstanding of HID | |
374 | * specification 1.11, 6.2.2.7 Global Items. Attempt to handle | |
375 | * both this and the standard encoding. */ | |
376 | raw_value = item_sdata(item); | |
77463838 BT |
377 | if (!(raw_value & 0xfffffff0)) |
378 | parser->global.unit_exponent = hid_snto32(raw_value, 4); | |
379 | else | |
380 | parser->global.unit_exponent = raw_value; | |
880d29f1 | 381 | return 0; |
dde5845a | 382 | |
880d29f1 JS |
383 | case HID_GLOBAL_ITEM_TAG_UNIT: |
384 | parser->global.unit = item_udata(item); | |
385 | return 0; | |
dde5845a | 386 | |
880d29f1 JS |
387 | case HID_GLOBAL_ITEM_TAG_REPORT_SIZE: |
388 | parser->global.report_size = item_udata(item); | |
23408f95 | 389 | if (parser->global.report_size > 128) { |
8c3d52fc | 390 | hid_err(parser->device, "invalid report_size %d\n", |
880d29f1 JS |
391 | parser->global.report_size); |
392 | return -1; | |
393 | } | |
394 | return 0; | |
dde5845a | 395 | |
880d29f1 JS |
396 | case HID_GLOBAL_ITEM_TAG_REPORT_COUNT: |
397 | parser->global.report_count = item_udata(item); | |
398 | if (parser->global.report_count > HID_MAX_USAGES) { | |
8c3d52fc | 399 | hid_err(parser->device, "invalid report_count %d\n", |
880d29f1 JS |
400 | parser->global.report_count); |
401 | return -1; | |
402 | } | |
403 | return 0; | |
dde5845a | 404 | |
880d29f1 JS |
405 | case HID_GLOBAL_ITEM_TAG_REPORT_ID: |
406 | parser->global.report_id = item_udata(item); | |
43622021 KC |
407 | if (parser->global.report_id == 0 || |
408 | parser->global.report_id >= HID_MAX_IDS) { | |
409 | hid_err(parser->device, "report_id %u is invalid\n", | |
410 | parser->global.report_id); | |
dde5845a | 411 | return -1; |
880d29f1 JS |
412 | } |
413 | return 0; | |
414 | ||
415 | default: | |
8c3d52fc | 416 | hid_err(parser->device, "unknown global tag 0x%x\n", item->tag); |
880d29f1 | 417 | return -1; |
dde5845a JK |
418 | } |
419 | } | |
420 | ||
421 | /* | |
422 | * Process a local item. | |
423 | */ | |
424 | ||
425 | static int hid_parser_local(struct hid_parser *parser, struct hid_item *item) | |
426 | { | |
427 | __u32 data; | |
428 | unsigned n; | |
ba532198 | 429 | __u32 count; |
dde5845a | 430 | |
dde5845a JK |
431 | data = item_udata(item); |
432 | ||
433 | switch (item->tag) { | |
880d29f1 JS |
434 | case HID_LOCAL_ITEM_TAG_DELIMITER: |
435 | ||
436 | if (data) { | |
437 | /* | |
438 | * We treat items before the first delimiter | |
439 | * as global to all usage sets (branch 0). | |
440 | * In the moment we process only these global | |
441 | * items and the first delimiter set. | |
442 | */ | |
443 | if (parser->local.delimiter_depth != 0) { | |
8c3d52fc | 444 | hid_err(parser->device, "nested delimiters\n"); |
880d29f1 | 445 | return -1; |
dde5845a | 446 | } |
880d29f1 JS |
447 | parser->local.delimiter_depth++; |
448 | parser->local.delimiter_branch++; | |
449 | } else { | |
450 | if (parser->local.delimiter_depth < 1) { | |
8c3d52fc | 451 | hid_err(parser->device, "bogus close delimiter\n"); |
880d29f1 | 452 | return -1; |
dde5845a | 453 | } |
880d29f1 JS |
454 | parser->local.delimiter_depth--; |
455 | } | |
38ead6ef | 456 | return 0; |
dde5845a | 457 | |
880d29f1 | 458 | case HID_LOCAL_ITEM_TAG_USAGE: |
dde5845a | 459 | |
880d29f1 JS |
460 | if (parser->local.delimiter_branch > 1) { |
461 | dbg_hid("alternative usage ignored\n"); | |
462 | return 0; | |
463 | } | |
dde5845a | 464 | |
880d29f1 JS |
465 | if (item->size <= 2) |
466 | data = (parser->global.usage_page << 16) + data; | |
dde5845a | 467 | |
880d29f1 | 468 | return hid_add_usage(parser, data); |
dde5845a | 469 | |
880d29f1 | 470 | case HID_LOCAL_ITEM_TAG_USAGE_MINIMUM: |
dde5845a | 471 | |
880d29f1 JS |
472 | if (parser->local.delimiter_branch > 1) { |
473 | dbg_hid("alternative usage ignored\n"); | |
dde5845a | 474 | return 0; |
880d29f1 | 475 | } |
dde5845a | 476 | |
880d29f1 JS |
477 | if (item->size <= 2) |
478 | data = (parser->global.usage_page << 16) + data; | |
dde5845a | 479 | |
880d29f1 JS |
480 | parser->local.usage_minimum = data; |
481 | return 0; | |
dde5845a | 482 | |
880d29f1 | 483 | case HID_LOCAL_ITEM_TAG_USAGE_MAXIMUM: |
dde5845a | 484 | |
880d29f1 JS |
485 | if (parser->local.delimiter_branch > 1) { |
486 | dbg_hid("alternative usage ignored\n"); | |
dde5845a | 487 | return 0; |
880d29f1 | 488 | } |
dde5845a | 489 | |
880d29f1 JS |
490 | if (item->size <= 2) |
491 | data = (parser->global.usage_page << 16) + data; | |
dde5845a | 492 | |
ba532198 BT |
493 | count = data - parser->local.usage_minimum; |
494 | if (count + parser->local.usage_index >= HID_MAX_USAGES) { | |
495 | /* | |
496 | * We do not warn if the name is not set, we are | |
497 | * actually pre-scanning the device. | |
498 | */ | |
499 | if (dev_name(&parser->device->dev)) | |
500 | hid_warn(parser->device, | |
501 | "ignoring exceeding usage max\n"); | |
502 | data = HID_MAX_USAGES - parser->local.usage_index + | |
503 | parser->local.usage_minimum - 1; | |
504 | if (data <= 0) { | |
505 | hid_err(parser->device, | |
506 | "no more usage index available\n"); | |
507 | return -1; | |
508 | } | |
509 | } | |
510 | ||
880d29f1 JS |
511 | for (n = parser->local.usage_minimum; n <= data; n++) |
512 | if (hid_add_usage(parser, n)) { | |
513 | dbg_hid("hid_add_usage failed\n"); | |
514 | return -1; | |
515 | } | |
516 | return 0; | |
517 | ||
518 | default: | |
519 | ||
520 | dbg_hid("unknown local item tag 0x%x\n", item->tag); | |
521 | return 0; | |
dde5845a JK |
522 | } |
523 | return 0; | |
524 | } | |
525 | ||
526 | /* | |
527 | * Process a main item. | |
528 | */ | |
529 | ||
530 | static int hid_parser_main(struct hid_parser *parser, struct hid_item *item) | |
531 | { | |
532 | __u32 data; | |
533 | int ret; | |
534 | ||
535 | data = item_udata(item); | |
536 | ||
537 | switch (item->tag) { | |
880d29f1 JS |
538 | case HID_MAIN_ITEM_TAG_BEGIN_COLLECTION: |
539 | ret = open_collection(parser, data & 0xff); | |
540 | break; | |
541 | case HID_MAIN_ITEM_TAG_END_COLLECTION: | |
542 | ret = close_collection(parser); | |
543 | break; | |
544 | case HID_MAIN_ITEM_TAG_INPUT: | |
545 | ret = hid_add_field(parser, HID_INPUT_REPORT, data); | |
546 | break; | |
547 | case HID_MAIN_ITEM_TAG_OUTPUT: | |
548 | ret = hid_add_field(parser, HID_OUTPUT_REPORT, data); | |
549 | break; | |
550 | case HID_MAIN_ITEM_TAG_FEATURE: | |
551 | ret = hid_add_field(parser, HID_FEATURE_REPORT, data); | |
552 | break; | |
553 | default: | |
7cb4774e | 554 | hid_warn(parser->device, "unknown main item tag 0x%x\n", item->tag); |
880d29f1 | 555 | ret = 0; |
dde5845a JK |
556 | } |
557 | ||
558 | memset(&parser->local, 0, sizeof(parser->local)); /* Reset the local parser environment */ | |
559 | ||
560 | return ret; | |
561 | } | |
562 | ||
563 | /* | |
564 | * Process a reserved item. | |
565 | */ | |
566 | ||
567 | static int hid_parser_reserved(struct hid_parser *parser, struct hid_item *item) | |
568 | { | |
58037eb9 | 569 | dbg_hid("reserved item type, tag 0x%x\n", item->tag); |
dde5845a JK |
570 | return 0; |
571 | } | |
572 | ||
573 | /* | |
574 | * Free a report and all registered fields. The field->usage and | |
575 | * field->value table's are allocated behind the field, so we need | |
576 | * only to free(field) itself. | |
577 | */ | |
578 | ||
579 | static void hid_free_report(struct hid_report *report) | |
580 | { | |
581 | unsigned n; | |
582 | ||
583 | for (n = 0; n < report->maxfield; n++) | |
584 | kfree(report->field[n]); | |
585 | kfree(report); | |
586 | } | |
587 | ||
588 | /* | |
a7197c2e HR |
589 | * Close report. This function returns the device |
590 | * state to the point prior to hid_open_report(). | |
dde5845a | 591 | */ |
a7197c2e | 592 | static void hid_close_report(struct hid_device *device) |
dde5845a | 593 | { |
85cdaf52 | 594 | unsigned i, j; |
dde5845a JK |
595 | |
596 | for (i = 0; i < HID_REPORT_TYPES; i++) { | |
597 | struct hid_report_enum *report_enum = device->report_enum + i; | |
598 | ||
43622021 | 599 | for (j = 0; j < HID_MAX_IDS; j++) { |
dde5845a JK |
600 | struct hid_report *report = report_enum->report_id_hash[j]; |
601 | if (report) | |
602 | hid_free_report(report); | |
603 | } | |
a7197c2e HR |
604 | memset(report_enum, 0, sizeof(*report_enum)); |
605 | INIT_LIST_HEAD(&report_enum->report_list); | |
dde5845a JK |
606 | } |
607 | ||
608 | kfree(device->rdesc); | |
a7197c2e HR |
609 | device->rdesc = NULL; |
610 | device->rsize = 0; | |
611 | ||
767fe787 | 612 | kfree(device->collection); |
a7197c2e HR |
613 | device->collection = NULL; |
614 | device->collection_size = 0; | |
615 | device->maxcollection = 0; | |
616 | device->maxapplication = 0; | |
617 | ||
618 | device->status &= ~HID_STAT_PARSED; | |
619 | } | |
620 | ||
621 | /* | |
622 | * Free a device structure, all reports, and all fields. | |
623 | */ | |
624 | ||
625 | static void hid_device_release(struct device *dev) | |
626 | { | |
ee79a8f8 | 627 | struct hid_device *hid = to_hid_device(dev); |
a7197c2e HR |
628 | |
629 | hid_close_report(hid); | |
630 | kfree(hid->dev_rdesc); | |
631 | kfree(hid); | |
dde5845a JK |
632 | } |
633 | ||
634 | /* | |
635 | * Fetch a report description item from the data stream. We support long | |
636 | * items, though they are not used yet. | |
637 | */ | |
638 | ||
639 | static u8 *fetch_item(__u8 *start, __u8 *end, struct hid_item *item) | |
640 | { | |
641 | u8 b; | |
642 | ||
643 | if ((end - start) <= 0) | |
644 | return NULL; | |
645 | ||
646 | b = *start++; | |
647 | ||
648 | item->type = (b >> 2) & 3; | |
649 | item->tag = (b >> 4) & 15; | |
650 | ||
651 | if (item->tag == HID_ITEM_TAG_LONG) { | |
652 | ||
653 | item->format = HID_ITEM_FORMAT_LONG; | |
654 | ||
655 | if ((end - start) < 2) | |
656 | return NULL; | |
657 | ||
658 | item->size = *start++; | |
659 | item->tag = *start++; | |
660 | ||
661 | if ((end - start) < item->size) | |
662 | return NULL; | |
663 | ||
664 | item->data.longdata = start; | |
665 | start += item->size; | |
666 | return start; | |
667 | } | |
668 | ||
669 | item->format = HID_ITEM_FORMAT_SHORT; | |
670 | item->size = b & 3; | |
671 | ||
672 | switch (item->size) { | |
880d29f1 JS |
673 | case 0: |
674 | return start; | |
dde5845a | 675 | |
880d29f1 JS |
676 | case 1: |
677 | if ((end - start) < 1) | |
678 | return NULL; | |
679 | item->data.u8 = *start++; | |
680 | return start; | |
681 | ||
682 | case 2: | |
683 | if ((end - start) < 2) | |
684 | return NULL; | |
685 | item->data.u16 = get_unaligned_le16(start); | |
686 | start = (__u8 *)((__le16 *)start + 1); | |
687 | return start; | |
688 | ||
689 | case 3: | |
690 | item->size++; | |
691 | if ((end - start) < 4) | |
692 | return NULL; | |
693 | item->data.u32 = get_unaligned_le32(start); | |
694 | start = (__u8 *)((__le32 *)start + 1); | |
695 | return start; | |
dde5845a JK |
696 | } |
697 | ||
698 | return NULL; | |
699 | } | |
700 | ||
3dc8fc08 | 701 | static void hid_scan_input_usage(struct hid_parser *parser, u32 usage) |
734c6609 | 702 | { |
3dc8fc08 BT |
703 | struct hid_device *hid = parser->device; |
704 | ||
4fa3a583 HR |
705 | if (usage == HID_DG_CONTACTID) |
706 | hid->group = HID_GROUP_MULTITOUCH; | |
734c6609 HR |
707 | } |
708 | ||
f961bd35 BT |
709 | static void hid_scan_feature_usage(struct hid_parser *parser, u32 usage) |
710 | { | |
711 | if (usage == 0xff0000c5 && parser->global.report_count == 256 && | |
712 | parser->global.report_size == 8) | |
713 | parser->scan_flags |= HID_SCAN_FLAG_MT_WIN_8; | |
714 | } | |
715 | ||
3dc8fc08 BT |
716 | static void hid_scan_collection(struct hid_parser *parser, unsigned type) |
717 | { | |
718 | struct hid_device *hid = parser->device; | |
e39f2d59 | 719 | int i; |
3dc8fc08 BT |
720 | |
721 | if (((parser->global.usage_page << 16) == HID_UP_SENSOR) && | |
722 | type == HID_COLLECTION_PHYSICAL) | |
723 | hid->group = HID_GROUP_SENSOR_HUB; | |
be3b1634 AW |
724 | |
725 | if (hid->vendor == USB_VENDOR_ID_MICROSOFT && | |
0a76ac80 | 726 | hid->product == USB_DEVICE_ID_MS_POWER_COVER && |
be3b1634 AW |
727 | hid->group == HID_GROUP_MULTITOUCH) |
728 | hid->group = HID_GROUP_GENERIC; | |
e39f2d59 AD |
729 | |
730 | if ((parser->global.usage_page << 16) == HID_UP_GENDESK) | |
731 | for (i = 0; i < parser->local.usage_index; i++) | |
732 | if (parser->local.usage[i] == HID_GD_POINTER) | |
733 | parser->scan_flags |= HID_SCAN_FLAG_GD_POINTER; | |
734 | ||
735 | if ((parser->global.usage_page << 16) >= HID_UP_MSVENDOR) | |
736 | parser->scan_flags |= HID_SCAN_FLAG_VENDOR_SPECIFIC; | |
3dc8fc08 BT |
737 | } |
738 | ||
739 | static int hid_scan_main(struct hid_parser *parser, struct hid_item *item) | |
740 | { | |
741 | __u32 data; | |
742 | int i; | |
743 | ||
744 | data = item_udata(item); | |
745 | ||
746 | switch (item->tag) { | |
747 | case HID_MAIN_ITEM_TAG_BEGIN_COLLECTION: | |
748 | hid_scan_collection(parser, data & 0xff); | |
749 | break; | |
750 | case HID_MAIN_ITEM_TAG_END_COLLECTION: | |
751 | break; | |
752 | case HID_MAIN_ITEM_TAG_INPUT: | |
e24d0d39 BT |
753 | /* ignore constant inputs, they will be ignored by hid-input */ |
754 | if (data & HID_MAIN_ITEM_CONSTANT) | |
755 | break; | |
3dc8fc08 BT |
756 | for (i = 0; i < parser->local.usage_index; i++) |
757 | hid_scan_input_usage(parser, parser->local.usage[i]); | |
758 | break; | |
759 | case HID_MAIN_ITEM_TAG_OUTPUT: | |
760 | break; | |
761 | case HID_MAIN_ITEM_TAG_FEATURE: | |
f961bd35 BT |
762 | for (i = 0; i < parser->local.usage_index; i++) |
763 | hid_scan_feature_usage(parser, parser->local.usage[i]); | |
3dc8fc08 BT |
764 | break; |
765 | } | |
766 | ||
767 | /* Reset the local parser environment */ | |
768 | memset(&parser->local, 0, sizeof(parser->local)); | |
769 | ||
770 | return 0; | |
771 | } | |
772 | ||
734c6609 HR |
773 | /* |
774 | * Scan a report descriptor before the device is added to the bus. | |
775 | * Sets device groups and other properties that determine what driver | |
776 | * to load. | |
777 | */ | |
778 | static int hid_scan_report(struct hid_device *hid) | |
779 | { | |
3dc8fc08 BT |
780 | struct hid_parser *parser; |
781 | struct hid_item item; | |
734c6609 HR |
782 | __u8 *start = hid->dev_rdesc; |
783 | __u8 *end = start + hid->dev_rsize; | |
3dc8fc08 BT |
784 | static int (*dispatch_type[])(struct hid_parser *parser, |
785 | struct hid_item *item) = { | |
786 | hid_scan_main, | |
787 | hid_parser_global, | |
788 | hid_parser_local, | |
789 | hid_parser_reserved | |
790 | }; | |
791 | ||
792 | parser = vzalloc(sizeof(struct hid_parser)); | |
793 | if (!parser) | |
794 | return -ENOMEM; | |
734c6609 | 795 | |
3dc8fc08 | 796 | parser->device = hid; |
734c6609 | 797 | hid->group = HID_GROUP_GENERIC; |
734c6609 | 798 | |
3dc8fc08 BT |
799 | /* |
800 | * The parsing is simpler than the one in hid_open_report() as we should | |
801 | * be robust against hid errors. Those errors will be raised by | |
802 | * hid_open_report() anyway. | |
803 | */ | |
804 | while ((start = fetch_item(start, end, &item)) != NULL) | |
805 | dispatch_type[item.type](parser, &item); | |
806 | ||
f961bd35 BT |
807 | /* |
808 | * Handle special flags set during scanning. | |
809 | */ | |
810 | if ((parser->scan_flags & HID_SCAN_FLAG_MT_WIN_8) && | |
811 | (hid->group == HID_GROUP_MULTITOUCH)) | |
812 | hid->group = HID_GROUP_MULTITOUCH_WIN_8; | |
813 | ||
29b47391 BT |
814 | /* |
815 | * Vendor specific handlings | |
816 | */ | |
817 | switch (hid->vendor) { | |
818 | case USB_VENDOR_ID_WACOM: | |
819 | hid->group = HID_GROUP_WACOM; | |
820 | break; | |
c241c5ee | 821 | case USB_VENDOR_ID_SYNAPTICS: |
84379d83 | 822 | if (hid->group == HID_GROUP_GENERIC) |
e39f2d59 AD |
823 | if ((parser->scan_flags & HID_SCAN_FLAG_VENDOR_SPECIFIC) |
824 | && (parser->scan_flags & HID_SCAN_FLAG_GD_POINTER)) | |
825 | /* | |
826 | * hid-rmi should take care of them, | |
827 | * not hid-generic | |
828 | */ | |
0ca4cd7b | 829 | hid->group = HID_GROUP_RMI; |
c241c5ee | 830 | break; |
29b47391 BT |
831 | } |
832 | ||
3dc8fc08 | 833 | vfree(parser); |
734c6609 HR |
834 | return 0; |
835 | } | |
836 | ||
85cdaf52 JS |
837 | /** |
838 | * hid_parse_report - parse device report | |
839 | * | |
840 | * @device: hid device | |
841 | * @start: report start | |
842 | * @size: report size | |
843 | * | |
a7197c2e HR |
844 | * Allocate the device report as read by the bus driver. This function should |
845 | * only be called from parse() in ll drivers. | |
846 | */ | |
847 | int hid_parse_report(struct hid_device *hid, __u8 *start, unsigned size) | |
848 | { | |
849 | hid->dev_rdesc = kmemdup(start, size, GFP_KERNEL); | |
850 | if (!hid->dev_rdesc) | |
851 | return -ENOMEM; | |
852 | hid->dev_rsize = size; | |
853 | return 0; | |
854 | } | |
855 | EXPORT_SYMBOL_GPL(hid_parse_report); | |
856 | ||
331415ff KC |
857 | static const char * const hid_report_names[] = { |
858 | "HID_INPUT_REPORT", | |
859 | "HID_OUTPUT_REPORT", | |
860 | "HID_FEATURE_REPORT", | |
861 | }; | |
862 | /** | |
863 | * hid_validate_values - validate existing device report's value indexes | |
864 | * | |
865 | * @device: hid device | |
866 | * @type: which report type to examine | |
867 | * @id: which report ID to examine (0 for first) | |
868 | * @field_index: which report field to examine | |
869 | * @report_counts: expected number of values | |
870 | * | |
871 | * Validate the number of values in a given field of a given report, after | |
872 | * parsing. | |
873 | */ | |
874 | struct hid_report *hid_validate_values(struct hid_device *hid, | |
875 | unsigned int type, unsigned int id, | |
876 | unsigned int field_index, | |
877 | unsigned int report_counts) | |
878 | { | |
879 | struct hid_report *report; | |
880 | ||
881 | if (type > HID_FEATURE_REPORT) { | |
882 | hid_err(hid, "invalid HID report type %u\n", type); | |
883 | return NULL; | |
884 | } | |
885 | ||
886 | if (id >= HID_MAX_IDS) { | |
887 | hid_err(hid, "invalid HID report id %u\n", id); | |
888 | return NULL; | |
889 | } | |
890 | ||
891 | /* | |
892 | * Explicitly not using hid_get_report() here since it depends on | |
893 | * ->numbered being checked, which may not always be the case when | |
894 | * drivers go to access report values. | |
895 | */ | |
1b15d2e5 KC |
896 | if (id == 0) { |
897 | /* | |
898 | * Validating on id 0 means we should examine the first | |
899 | * report in the list. | |
900 | */ | |
901 | report = list_entry( | |
902 | hid->report_enum[type].report_list.next, | |
903 | struct hid_report, list); | |
904 | } else { | |
905 | report = hid->report_enum[type].report_id_hash[id]; | |
906 | } | |
331415ff KC |
907 | if (!report) { |
908 | hid_err(hid, "missing %s %u\n", hid_report_names[type], id); | |
909 | return NULL; | |
910 | } | |
911 | if (report->maxfield <= field_index) { | |
912 | hid_err(hid, "not enough fields in %s %u\n", | |
913 | hid_report_names[type], id); | |
914 | return NULL; | |
915 | } | |
916 | if (report->field[field_index]->report_count < report_counts) { | |
917 | hid_err(hid, "not enough values in %s %u field %u\n", | |
918 | hid_report_names[type], id, field_index); | |
919 | return NULL; | |
920 | } | |
921 | return report; | |
922 | } | |
923 | EXPORT_SYMBOL_GPL(hid_validate_values); | |
924 | ||
a7197c2e HR |
925 | /** |
926 | * hid_open_report - open a driver-specific device report | |
927 | * | |
928 | * @device: hid device | |
929 | * | |
dde5845a JK |
930 | * Parse a report description into a hid_device structure. Reports are |
931 | * enumerated, fields are attached to these reports. | |
85cdaf52 | 932 | * 0 returned on success, otherwise nonzero error value. |
a7197c2e HR |
933 | * |
934 | * This function (or the equivalent hid_parse() macro) should only be | |
935 | * called from probe() in drivers, before starting the device. | |
dde5845a | 936 | */ |
a7197c2e | 937 | int hid_open_report(struct hid_device *device) |
dde5845a | 938 | { |
dde5845a JK |
939 | struct hid_parser *parser; |
940 | struct hid_item item; | |
a7197c2e HR |
941 | unsigned int size; |
942 | __u8 *start; | |
86e6b77e | 943 | __u8 *buf; |
dde5845a | 944 | __u8 *end; |
85cdaf52 | 945 | int ret; |
dde5845a JK |
946 | static int (*dispatch_type[])(struct hid_parser *parser, |
947 | struct hid_item *item) = { | |
948 | hid_parser_main, | |
949 | hid_parser_global, | |
950 | hid_parser_local, | |
951 | hid_parser_reserved | |
952 | }; | |
953 | ||
a7197c2e HR |
954 | if (WARN_ON(device->status & HID_STAT_PARSED)) |
955 | return -EBUSY; | |
956 | ||
957 | start = device->dev_rdesc; | |
958 | if (WARN_ON(!start)) | |
959 | return -ENODEV; | |
960 | size = device->dev_rsize; | |
961 | ||
86e6b77e KD |
962 | buf = kmemdup(start, size, GFP_KERNEL); |
963 | if (buf == NULL) | |
964 | return -ENOMEM; | |
965 | ||
c500c971 | 966 | if (device->driver->report_fixup) |
86e6b77e KD |
967 | start = device->driver->report_fixup(device, buf, &size); |
968 | else | |
969 | start = buf; | |
c500c971 | 970 | |
86e6b77e KD |
971 | start = kmemdup(start, size, GFP_KERNEL); |
972 | kfree(buf); | |
973 | if (start == NULL) | |
85cdaf52 | 974 | return -ENOMEM; |
86e6b77e KD |
975 | |
976 | device->rdesc = start; | |
dde5845a JK |
977 | device->rsize = size; |
978 | ||
fe258020 | 979 | parser = vzalloc(sizeof(struct hid_parser)); |
85cdaf52 JS |
980 | if (!parser) { |
981 | ret = -ENOMEM; | |
982 | goto err; | |
dde5845a | 983 | } |
85cdaf52 | 984 | |
dde5845a JK |
985 | parser->device = device; |
986 | ||
987 | end = start + size; | |
a7197c2e HR |
988 | |
989 | device->collection = kcalloc(HID_DEFAULT_NUM_COLLECTIONS, | |
990 | sizeof(struct hid_collection), GFP_KERNEL); | |
991 | if (!device->collection) { | |
992 | ret = -ENOMEM; | |
993 | goto err; | |
994 | } | |
995 | device->collection_size = HID_DEFAULT_NUM_COLLECTIONS; | |
996 | ||
85cdaf52 | 997 | ret = -EINVAL; |
dde5845a JK |
998 | while ((start = fetch_item(start, end, &item)) != NULL) { |
999 | ||
1000 | if (item.format != HID_ITEM_FORMAT_SHORT) { | |
8c3d52fc | 1001 | hid_err(device, "unexpected long global item\n"); |
85cdaf52 | 1002 | goto err; |
dde5845a JK |
1003 | } |
1004 | ||
1005 | if (dispatch_type[item.type](parser, &item)) { | |
8c3d52fc | 1006 | hid_err(device, "item %u %u %u %u parsing failed\n", |
4291ee30 JP |
1007 | item.format, (unsigned)item.size, |
1008 | (unsigned)item.type, (unsigned)item.tag); | |
85cdaf52 | 1009 | goto err; |
dde5845a JK |
1010 | } |
1011 | ||
1012 | if (start == end) { | |
1013 | if (parser->collection_stack_ptr) { | |
8c3d52fc | 1014 | hid_err(device, "unbalanced collection at end of report description\n"); |
85cdaf52 | 1015 | goto err; |
dde5845a JK |
1016 | } |
1017 | if (parser->local.delimiter_depth) { | |
8c3d52fc | 1018 | hid_err(device, "unbalanced delimiter at end of report description\n"); |
85cdaf52 | 1019 | goto err; |
dde5845a | 1020 | } |
47a80edb | 1021 | vfree(parser); |
a7197c2e | 1022 | device->status |= HID_STAT_PARSED; |
85cdaf52 | 1023 | return 0; |
dde5845a JK |
1024 | } |
1025 | } | |
1026 | ||
8c3d52fc | 1027 | hid_err(device, "item fetching failed at offset %d\n", (int)(end - start)); |
85cdaf52 | 1028 | err: |
47a80edb | 1029 | vfree(parser); |
a7197c2e | 1030 | hid_close_report(device); |
85cdaf52 | 1031 | return ret; |
dde5845a | 1032 | } |
a7197c2e | 1033 | EXPORT_SYMBOL_GPL(hid_open_report); |
dde5845a JK |
1034 | |
1035 | /* | |
1036 | * Convert a signed n-bit integer to signed 32-bit integer. Common | |
1037 | * cases are done through the compiler, the screwed things has to be | |
1038 | * done by hand. | |
1039 | */ | |
1040 | ||
1041 | static s32 snto32(__u32 value, unsigned n) | |
1042 | { | |
1043 | switch (n) { | |
880d29f1 JS |
1044 | case 8: return ((__s8)value); |
1045 | case 16: return ((__s16)value); | |
1046 | case 32: return ((__s32)value); | |
dde5845a | 1047 | } |
08585e43 | 1048 | return value & (1 << (n - 1)) ? value | (~0U << n) : value; |
dde5845a JK |
1049 | } |
1050 | ||
77463838 BT |
1051 | s32 hid_snto32(__u32 value, unsigned n) |
1052 | { | |
1053 | return snto32(value, n); | |
1054 | } | |
1055 | EXPORT_SYMBOL_GPL(hid_snto32); | |
1056 | ||
dde5845a JK |
1057 | /* |
1058 | * Convert a signed 32-bit integer to a signed n-bit integer. | |
1059 | */ | |
1060 | ||
1061 | static u32 s32ton(__s32 value, unsigned n) | |
1062 | { | |
1063 | s32 a = value >> (n - 1); | |
1064 | if (a && a != -1) | |
1065 | return value < 0 ? 1 << (n - 1) : (1 << (n - 1)) - 1; | |
1066 | return value & ((1 << n) - 1); | |
1067 | } | |
1068 | ||
1069 | /* | |
1070 | * Extract/implement a data field from/to a little endian report (bit array). | |
1071 | * | |
1072 | * Code sort-of follows HID spec: | |
5137b354 | 1073 | * http://www.usb.org/developers/hidpage/HID1_11.pdf |
dde5845a JK |
1074 | * |
1075 | * While the USB HID spec allows unlimited length bit fields in "report | |
1076 | * descriptors", most devices never use more than 16 bits. | |
1077 | * One model of UPS is claimed to report "LINEV" as a 32-bit field. | |
1078 | * Search linux-kernel and linux-usb-devel archives for "hid-core extract". | |
1079 | */ | |
1080 | ||
5137b354 | 1081 | static u32 __extract(u8 *report, unsigned offset, int n) |
dde5845a | 1082 | { |
5137b354 DT |
1083 | unsigned int idx = offset / 8; |
1084 | unsigned int bit_nr = 0; | |
1085 | unsigned int bit_shift = offset % 8; | |
1086 | int bits_to_copy = 8 - bit_shift; | |
1087 | u32 value = 0; | |
1088 | u32 mask = n < 32 ? (1U << n) - 1 : ~0U; | |
1089 | ||
1090 | while (n > 0) { | |
1091 | value |= ((u32)report[idx] >> bit_shift) << bit_nr; | |
1092 | n -= bits_to_copy; | |
1093 | bit_nr += bits_to_copy; | |
1094 | bits_to_copy = 8; | |
1095 | bit_shift = 0; | |
1096 | idx++; | |
1097 | } | |
1098 | ||
1099 | return value & mask; | |
1100 | } | |
dde5845a | 1101 | |
5137b354 DT |
1102 | u32 hid_field_extract(const struct hid_device *hid, u8 *report, |
1103 | unsigned offset, unsigned n) | |
1104 | { | |
1105 | if (n > 32) { | |
04fba786 | 1106 | hid_warn(hid, "hid_field_extract() called with n (%d) > 32! (%s)\n", |
4291ee30 | 1107 | n, current->comm); |
5137b354 DT |
1108 | n = 32; |
1109 | } | |
dde5845a | 1110 | |
5137b354 | 1111 | return __extract(report, offset, n); |
dde5845a | 1112 | } |
04fba786 | 1113 | EXPORT_SYMBOL_GPL(hid_field_extract); |
dde5845a JK |
1114 | |
1115 | /* | |
1116 | * "implement" : set bits in a little endian bit stream. | |
1117 | * Same concepts as "extract" (see comments above). | |
1118 | * The data mangled in the bit stream remains in little endian | |
1119 | * order the whole time. It make more sense to talk about | |
1120 | * endianness of register values by considering a register | |
5137b354 | 1121 | * a "cached" copy of the little endian bit stream. |
dde5845a | 1122 | */ |
5137b354 DT |
1123 | |
1124 | static void __implement(u8 *report, unsigned offset, int n, u32 value) | |
1125 | { | |
1126 | unsigned int idx = offset / 8; | |
5137b354 DT |
1127 | unsigned int bit_shift = offset % 8; |
1128 | int bits_to_set = 8 - bit_shift; | |
5137b354 DT |
1129 | |
1130 | while (n - bits_to_set >= 0) { | |
95d1c895 | 1131 | report[idx] &= ~(0xff << bit_shift); |
5137b354 DT |
1132 | report[idx] |= value << bit_shift; |
1133 | value >>= bits_to_set; | |
1134 | n -= bits_to_set; | |
1135 | bits_to_set = 8; | |
5137b354 DT |
1136 | bit_shift = 0; |
1137 | idx++; | |
1138 | } | |
1139 | ||
1140 | /* last nibble */ | |
1141 | if (n) { | |
95d1c895 DT |
1142 | u8 bit_mask = ((1U << n) - 1); |
1143 | report[idx] &= ~(bit_mask << bit_shift); | |
1144 | report[idx] |= value << bit_shift; | |
5137b354 DT |
1145 | } |
1146 | } | |
1147 | ||
1148 | static void implement(const struct hid_device *hid, u8 *report, | |
1149 | unsigned offset, unsigned n, u32 value) | |
dde5845a | 1150 | { |
95d1c895 | 1151 | if (unlikely(n > 32)) { |
4291ee30 JP |
1152 | hid_warn(hid, "%s() called with n (%d) > 32! (%s)\n", |
1153 | __func__, n, current->comm); | |
5137b354 | 1154 | n = 32; |
95d1c895 DT |
1155 | } else if (n < 32) { |
1156 | u32 m = (1U << n) - 1; | |
1157 | ||
1158 | if (unlikely(value > m)) { | |
1159 | hid_warn(hid, | |
1160 | "%s() called with too large value %d (n: %d)! (%s)\n", | |
1161 | __func__, value, n, current->comm); | |
1162 | WARN_ON(1); | |
1163 | value &= m; | |
1164 | } | |
5137b354 | 1165 | } |
dde5845a | 1166 | |
5137b354 | 1167 | __implement(report, offset, n, value); |
dde5845a JK |
1168 | } |
1169 | ||
1170 | /* | |
1171 | * Search an array for a value. | |
1172 | */ | |
1173 | ||
16ee4cc8 | 1174 | static int search(__s32 *array, __s32 value, unsigned n) |
dde5845a JK |
1175 | { |
1176 | while (n--) { | |
1177 | if (*array++ == value) | |
1178 | return 0; | |
1179 | } | |
1180 | return -1; | |
1181 | } | |
1182 | ||
85cdaf52 JS |
1183 | /** |
1184 | * hid_match_report - check if driver's raw_event should be called | |
1185 | * | |
1186 | * @hid: hid device | |
1187 | * @report_type: type to match against | |
1188 | * | |
1189 | * compare hid->driver->report_table->report_type to report->type | |
1190 | */ | |
1191 | static int hid_match_report(struct hid_device *hid, struct hid_report *report) | |
dde5845a | 1192 | { |
85cdaf52 JS |
1193 | const struct hid_report_id *id = hid->driver->report_table; |
1194 | ||
1195 | if (!id) /* NULL means all */ | |
1196 | return 1; | |
1197 | ||
1198 | for (; id->report_type != HID_TERMINATOR; id++) | |
1199 | if (id->report_type == HID_ANY_ID || | |
1200 | id->report_type == report->type) | |
1201 | return 1; | |
1202 | return 0; | |
1203 | } | |
1204 | ||
1205 | /** | |
1206 | * hid_match_usage - check if driver's event should be called | |
1207 | * | |
1208 | * @hid: hid device | |
1209 | * @usage: usage to match against | |
1210 | * | |
1211 | * compare hid->driver->usage_table->usage_{type,code} to | |
1212 | * usage->usage_{type,code} | |
1213 | */ | |
1214 | static int hid_match_usage(struct hid_device *hid, struct hid_usage *usage) | |
1215 | { | |
1216 | const struct hid_usage_id *id = hid->driver->usage_table; | |
1217 | ||
1218 | if (!id) /* NULL means all */ | |
1219 | return 1; | |
1220 | ||
1221 | for (; id->usage_type != HID_ANY_ID - 1; id++) | |
1222 | if ((id->usage_hid == HID_ANY_ID || | |
1223 | id->usage_hid == usage->hid) && | |
1224 | (id->usage_type == HID_ANY_ID || | |
1225 | id->usage_type == usage->type) && | |
1226 | (id->usage_code == HID_ANY_ID || | |
1227 | id->usage_code == usage->code)) | |
1228 | return 1; | |
1229 | return 0; | |
1230 | } | |
1231 | ||
1232 | static void hid_process_event(struct hid_device *hid, struct hid_field *field, | |
1233 | struct hid_usage *usage, __s32 value, int interrupt) | |
1234 | { | |
1235 | struct hid_driver *hdrv = hid->driver; | |
1236 | int ret; | |
1237 | ||
9bfc8da0 HR |
1238 | if (!list_empty(&hid->debug_list)) |
1239 | hid_dump_input(hid, usage, value); | |
85cdaf52 JS |
1240 | |
1241 | if (hdrv && hdrv->event && hid_match_usage(hid, usage)) { | |
1242 | ret = hdrv->event(hid, field, usage, value); | |
1243 | if (ret != 0) { | |
1244 | if (ret < 0) | |
8c3d52fc | 1245 | hid_err(hid, "%s's event failed with %d\n", |
85cdaf52 JS |
1246 | hdrv->name, ret); |
1247 | return; | |
1248 | } | |
1249 | } | |
1250 | ||
dde5845a JK |
1251 | if (hid->claimed & HID_CLAIMED_INPUT) |
1252 | hidinput_hid_event(hid, field, usage, value); | |
aa938f79 JK |
1253 | if (hid->claimed & HID_CLAIMED_HIDDEV && interrupt && hid->hiddev_hid_event) |
1254 | hid->hiddev_hid_event(hid, field, usage, value); | |
dde5845a JK |
1255 | } |
1256 | ||
1257 | /* | |
1258 | * Analyse a received field, and fetch the data from it. The field | |
1259 | * content is stored for next report processing (we do differential | |
1260 | * reporting to the layer). | |
1261 | */ | |
1262 | ||
abdff0f7 AB |
1263 | static void hid_input_field(struct hid_device *hid, struct hid_field *field, |
1264 | __u8 *data, int interrupt) | |
dde5845a JK |
1265 | { |
1266 | unsigned n; | |
1267 | unsigned count = field->report_count; | |
1268 | unsigned offset = field->report_offset; | |
1269 | unsigned size = field->report_size; | |
1270 | __s32 min = field->logical_minimum; | |
1271 | __s32 max = field->logical_maximum; | |
1272 | __s32 *value; | |
1273 | ||
a3789a17 JP |
1274 | value = kmalloc(sizeof(__s32) * count, GFP_ATOMIC); |
1275 | if (!value) | |
dde5845a JK |
1276 | return; |
1277 | ||
1278 | for (n = 0; n < count; n++) { | |
1279 | ||
4291ee30 | 1280 | value[n] = min < 0 ? |
04fba786 GB |
1281 | snto32(hid_field_extract(hid, data, offset + n * size, |
1282 | size), size) : | |
1283 | hid_field_extract(hid, data, offset + n * size, size); | |
dde5845a | 1284 | |
4291ee30 JP |
1285 | /* Ignore report if ErrorRollOver */ |
1286 | if (!(field->flags & HID_MAIN_ITEM_VARIABLE) && | |
1287 | value[n] >= min && value[n] <= max && | |
50220dea | 1288 | value[n] - min < field->maxusage && |
4291ee30 JP |
1289 | field->usage[value[n] - min].hid == HID_UP_KEYBOARD + 1) |
1290 | goto exit; | |
dde5845a JK |
1291 | } |
1292 | ||
1293 | for (n = 0; n < count; n++) { | |
1294 | ||
1295 | if (HID_MAIN_ITEM_VARIABLE & field->flags) { | |
1296 | hid_process_event(hid, field, &field->usage[n], value[n], interrupt); | |
1297 | continue; | |
1298 | } | |
1299 | ||
1300 | if (field->value[n] >= min && field->value[n] <= max | |
50220dea | 1301 | && field->value[n] - min < field->maxusage |
dde5845a JK |
1302 | && field->usage[field->value[n] - min].hid |
1303 | && search(value, field->value[n], count)) | |
1304 | hid_process_event(hid, field, &field->usage[field->value[n] - min], 0, interrupt); | |
1305 | ||
1306 | if (value[n] >= min && value[n] <= max | |
50220dea | 1307 | && value[n] - min < field->maxusage |
dde5845a JK |
1308 | && field->usage[value[n] - min].hid |
1309 | && search(field->value, value[n], count)) | |
1310 | hid_process_event(hid, field, &field->usage[value[n] - min], 1, interrupt); | |
1311 | } | |
1312 | ||
1313 | memcpy(field->value, value, count * sizeof(__s32)); | |
1314 | exit: | |
1315 | kfree(value); | |
1316 | } | |
dde5845a JK |
1317 | |
1318 | /* | |
1319 | * Output the field into the report. | |
1320 | */ | |
1321 | ||
4291ee30 JP |
1322 | static void hid_output_field(const struct hid_device *hid, |
1323 | struct hid_field *field, __u8 *data) | |
dde5845a JK |
1324 | { |
1325 | unsigned count = field->report_count; | |
1326 | unsigned offset = field->report_offset; | |
1327 | unsigned size = field->report_size; | |
1328 | unsigned n; | |
1329 | ||
1330 | for (n = 0; n < count; n++) { | |
1331 | if (field->logical_minimum < 0) /* signed values */ | |
4291ee30 JP |
1332 | implement(hid, data, offset + n * size, size, |
1333 | s32ton(field->value[n], size)); | |
dde5845a | 1334 | else /* unsigned values */ |
4291ee30 JP |
1335 | implement(hid, data, offset + n * size, size, |
1336 | field->value[n]); | |
dde5845a JK |
1337 | } |
1338 | } | |
1339 | ||
1340 | /* | |
27ce4050 JK |
1341 | * Create a report. 'data' has to be allocated using |
1342 | * hid_alloc_report_buf() so that it has proper size. | |
dde5845a JK |
1343 | */ |
1344 | ||
229695e5 | 1345 | void hid_output_report(struct hid_report *report, __u8 *data) |
dde5845a JK |
1346 | { |
1347 | unsigned n; | |
1348 | ||
1349 | if (report->id > 0) | |
1350 | *data++ = report->id; | |
1351 | ||
75c28df8 | 1352 | memset(data, 0, ((report->size - 1) >> 3) + 1); |
dde5845a | 1353 | for (n = 0; n < report->maxfield; n++) |
4291ee30 | 1354 | hid_output_field(report->device, report->field[n], data); |
dde5845a | 1355 | } |
229695e5 | 1356 | EXPORT_SYMBOL_GPL(hid_output_report); |
dde5845a | 1357 | |
27ce4050 JK |
1358 | /* |
1359 | * Allocator for buffer that is going to be passed to hid_output_report() | |
1360 | */ | |
1361 | u8 *hid_alloc_report_buf(struct hid_report *report, gfp_t flags) | |
1362 | { | |
1363 | /* | |
1364 | * 7 extra bytes are necessary to achieve proper functionality | |
1365 | * of implement() working on 8 byte chunks | |
1366 | */ | |
1367 | ||
6de0b13c | 1368 | u32 len = hid_report_len(report) + 7; |
27ce4050 JK |
1369 | |
1370 | return kmalloc(len, flags); | |
1371 | } | |
1372 | EXPORT_SYMBOL_GPL(hid_alloc_report_buf); | |
1373 | ||
dde5845a JK |
1374 | /* |
1375 | * Set a field value. The report this field belongs to has to be | |
1376 | * created and transferred to the device, to set this value in the | |
1377 | * device. | |
1378 | */ | |
1379 | ||
1380 | int hid_set_field(struct hid_field *field, unsigned offset, __s32 value) | |
1381 | { | |
be67b68d KC |
1382 | unsigned size; |
1383 | ||
1384 | if (!field) | |
1385 | return -1; | |
1386 | ||
1387 | size = field->report_size; | |
dde5845a | 1388 | |
cd667ce2 | 1389 | hid_dump_input(field->report->device, field->usage + offset, value); |
dde5845a JK |
1390 | |
1391 | if (offset >= field->report_count) { | |
8c3d52fc JK |
1392 | hid_err(field->report->device, "offset (%d) exceeds report_count (%d)\n", |
1393 | offset, field->report_count); | |
dde5845a JK |
1394 | return -1; |
1395 | } | |
1396 | if (field->logical_minimum < 0) { | |
1397 | if (value != snto32(s32ton(value, size), size)) { | |
8c3d52fc | 1398 | hid_err(field->report->device, "value %d is out of range\n", value); |
dde5845a JK |
1399 | return -1; |
1400 | } | |
1401 | } | |
1402 | field->value[offset] = value; | |
1403 | return 0; | |
1404 | } | |
229695e5 | 1405 | EXPORT_SYMBOL_GPL(hid_set_field); |
dde5845a | 1406 | |
85cdaf52 JS |
1407 | static struct hid_report *hid_get_report(struct hid_report_enum *report_enum, |
1408 | const u8 *data) | |
aa8de2f0 | 1409 | { |
aa8de2f0 | 1410 | struct hid_report *report; |
85cdaf52 | 1411 | unsigned int n = 0; /* Normally report number is 0 */ |
aa8de2f0 | 1412 | |
85cdaf52 JS |
1413 | /* Device uses numbered reports, data[0] is report number */ |
1414 | if (report_enum->numbered) | |
1415 | n = *data; | |
aa8de2f0 | 1416 | |
85cdaf52 JS |
1417 | report = report_enum->report_id_hash[n]; |
1418 | if (report == NULL) | |
1419 | dbg_hid("undefined report_id %u received\n", n); | |
aa8de2f0 | 1420 | |
85cdaf52 JS |
1421 | return report; |
1422 | } | |
aa8de2f0 | 1423 | |
4fa5a7f7 BT |
1424 | /* |
1425 | * Implement a generic .request() callback, using .raw_request() | |
1426 | * DO NOT USE in hid drivers directly, but through hid_hw_request instead. | |
1427 | */ | |
1428 | void __hid_request(struct hid_device *hid, struct hid_report *report, | |
1429 | int reqtype) | |
1430 | { | |
1431 | char *buf; | |
1432 | int ret; | |
6de0b13c | 1433 | u32 len; |
4fa5a7f7 | 1434 | |
4fa5a7f7 BT |
1435 | buf = hid_alloc_report_buf(report, GFP_KERNEL); |
1436 | if (!buf) | |
1437 | return; | |
1438 | ||
1439 | len = hid_report_len(report); | |
1440 | ||
1441 | if (reqtype == HID_REQ_SET_REPORT) | |
1442 | hid_output_report(report, buf); | |
1443 | ||
1444 | ret = hid->ll_driver->raw_request(hid, report->id, buf, len, | |
1445 | report->type, reqtype); | |
1446 | if (ret < 0) { | |
1447 | dbg_hid("unable to complete request: %d\n", ret); | |
1448 | goto out; | |
1449 | } | |
1450 | ||
1451 | if (reqtype == HID_REQ_GET_REPORT) | |
1452 | hid_input_report(hid, report->type, buf, ret, 0); | |
1453 | ||
1454 | out: | |
1455 | kfree(buf); | |
1456 | } | |
1457 | EXPORT_SYMBOL_GPL(__hid_request); | |
1458 | ||
6de0b13c | 1459 | int hid_report_raw_event(struct hid_device *hid, int type, u8 *data, u32 size, |
85cdaf52 JS |
1460 | int interrupt) |
1461 | { | |
1462 | struct hid_report_enum *report_enum = hid->report_enum + type; | |
1463 | struct hid_report *report; | |
6d85d037 | 1464 | struct hid_driver *hdrv; |
85cdaf52 | 1465 | unsigned int a; |
6de0b13c | 1466 | u32 rsize, csize = size; |
85cdaf52 | 1467 | u8 *cdata = data; |
b6787242 | 1468 | int ret = 0; |
aa8de2f0 | 1469 | |
85cdaf52 JS |
1470 | report = hid_get_report(report_enum, data); |
1471 | if (!report) | |
b6787242 | 1472 | goto out; |
aa8de2f0 | 1473 | |
85cdaf52 JS |
1474 | if (report_enum->numbered) { |
1475 | cdata++; | |
1476 | csize--; | |
aa8de2f0 JK |
1477 | } |
1478 | ||
1479 | rsize = ((report->size - 1) >> 3) + 1; | |
1480 | ||
966922f2 AV |
1481 | if (rsize > HID_MAX_BUFFER_SIZE) |
1482 | rsize = HID_MAX_BUFFER_SIZE; | |
1483 | ||
85cdaf52 JS |
1484 | if (csize < rsize) { |
1485 | dbg_hid("report %d is too short, (%d < %d)\n", report->id, | |
1486 | csize, rsize); | |
1487 | memset(cdata + csize, 0, rsize - csize); | |
aa8de2f0 JK |
1488 | } |
1489 | ||
1490 | if ((hid->claimed & HID_CLAIMED_HIDDEV) && hid->hiddev_report_event) | |
1491 | hid->hiddev_report_event(hid, report); | |
b6787242 JK |
1492 | if (hid->claimed & HID_CLAIMED_HIDRAW) { |
1493 | ret = hidraw_report_event(hid, data, size); | |
1494 | if (ret) | |
1495 | goto out; | |
1496 | } | |
aa8de2f0 | 1497 | |
cc6b54aa | 1498 | if (hid->claimed != HID_CLAIMED_HIDRAW && report->maxfield) { |
b94e3c94 MC |
1499 | for (a = 0; a < report->maxfield; a++) |
1500 | hid_input_field(hid, report->field[a], cdata, interrupt); | |
6d85d037 BT |
1501 | hdrv = hid->driver; |
1502 | if (hdrv && hdrv->report) | |
1503 | hdrv->report(hid, report); | |
b94e3c94 | 1504 | } |
aa8de2f0 JK |
1505 | |
1506 | if (hid->claimed & HID_CLAIMED_INPUT) | |
1507 | hidinput_report_event(hid, report); | |
b6787242 JK |
1508 | out: |
1509 | return ret; | |
85cdaf52 JS |
1510 | } |
1511 | EXPORT_SYMBOL_GPL(hid_report_raw_event); | |
1512 | ||
1513 | /** | |
1514 | * hid_input_report - report data from lower layer (usb, bt...) | |
1515 | * | |
1516 | * @hid: hid device | |
1517 | * @type: HID report type (HID_*_REPORT) | |
1518 | * @data: report contents | |
1519 | * @size: size of data parameter | |
ff9b00a2 | 1520 | * @interrupt: distinguish between interrupt and control transfers |
85cdaf52 JS |
1521 | * |
1522 | * This is data entry for lower layers. | |
1523 | */ | |
6de0b13c | 1524 | int hid_input_report(struct hid_device *hid, int type, u8 *data, u32 size, int interrupt) |
85cdaf52 | 1525 | { |
76c317d6 JL |
1526 | struct hid_report_enum *report_enum; |
1527 | struct hid_driver *hdrv; | |
85cdaf52 | 1528 | struct hid_report *report; |
45dc1ac7 | 1529 | int ret = 0; |
85cdaf52 | 1530 | |
4ea54542 | 1531 | if (!hid) |
85cdaf52 | 1532 | return -ENODEV; |
4ea54542 | 1533 | |
c849a614 | 1534 | if (down_trylock(&hid->driver_input_lock)) |
4ea54542 DH |
1535 | return -EBUSY; |
1536 | ||
1537 | if (!hid->driver) { | |
1538 | ret = -ENODEV; | |
1539 | goto unlock; | |
1540 | } | |
76c317d6 JL |
1541 | report_enum = hid->report_enum + type; |
1542 | hdrv = hid->driver; | |
85cdaf52 JS |
1543 | |
1544 | if (!size) { | |
1545 | dbg_hid("empty report\n"); | |
4ea54542 DH |
1546 | ret = -1; |
1547 | goto unlock; | |
85cdaf52 JS |
1548 | } |
1549 | ||
b94e3c94 | 1550 | /* Avoid unnecessary overhead if debugfs is disabled */ |
a5f04b9d BT |
1551 | if (!list_empty(&hid->debug_list)) |
1552 | hid_dump_report(hid, type, data, size); | |
85cdaf52 | 1553 | |
1caea61e JK |
1554 | report = hid_get_report(report_enum, data); |
1555 | ||
4ea54542 DH |
1556 | if (!report) { |
1557 | ret = -1; | |
1558 | goto unlock; | |
1559 | } | |
85cdaf52 JS |
1560 | |
1561 | if (hdrv && hdrv->raw_event && hid_match_report(hid, report)) { | |
1562 | ret = hdrv->raw_event(hid, report, data, size); | |
556483e2 | 1563 | if (ret < 0) |
4ea54542 | 1564 | goto unlock; |
85cdaf52 JS |
1565 | } |
1566 | ||
b6787242 | 1567 | ret = hid_report_raw_event(hid, type, data, size, interrupt); |
aa8de2f0 | 1568 | |
4ea54542 | 1569 | unlock: |
c849a614 | 1570 | up(&hid->driver_input_lock); |
45dc1ac7 | 1571 | return ret; |
aa8de2f0 JK |
1572 | } |
1573 | EXPORT_SYMBOL_GPL(hid_input_report); | |
1574 | ||
d5d3e202 BT |
1575 | bool hid_match_one_id(const struct hid_device *hdev, |
1576 | const struct hid_device_id *id) | |
0f37cd03 | 1577 | { |
7431fb76 | 1578 | return (id->bus == HID_BUS_ANY || id->bus == hdev->bus) && |
4d53b801 | 1579 | (id->group == HID_GROUP_ANY || id->group == hdev->group) && |
0f37cd03 JK |
1580 | (id->vendor == HID_ANY_ID || id->vendor == hdev->vendor) && |
1581 | (id->product == HID_ANY_ID || id->product == hdev->product); | |
1582 | } | |
1583 | ||
d5d3e202 | 1584 | const struct hid_device_id *hid_match_id(const struct hid_device *hdev, |
0f37cd03 JK |
1585 | const struct hid_device_id *id) |
1586 | { | |
1587 | for (; id->bus; id++) | |
1588 | if (hid_match_one_id(hdev, id)) | |
1589 | return id; | |
1590 | ||
1591 | return NULL; | |
1592 | } | |
1593 | ||
1594 | static const struct hid_device_id hid_hiddev_list[] = { | |
c0bd6a42 RH |
1595 | { HID_USB_DEVICE(USB_VENDOR_ID_MGE, USB_DEVICE_ID_MGE_UPS) }, |
1596 | { HID_USB_DEVICE(USB_VENDOR_ID_MGE, USB_DEVICE_ID_MGE_UPS1) }, | |
0f37cd03 JK |
1597 | { } |
1598 | }; | |
1599 | ||
1600 | static bool hid_hiddev(struct hid_device *hdev) | |
1601 | { | |
1602 | return !!hid_match_id(hdev, hid_hiddev_list); | |
1603 | } | |
1604 | ||
6d3bfb74 AO |
1605 | |
1606 | static ssize_t | |
1607 | read_report_descriptor(struct file *filp, struct kobject *kobj, | |
1608 | struct bin_attribute *attr, | |
1609 | char *buf, loff_t off, size_t count) | |
1610 | { | |
2cf83833 | 1611 | struct device *dev = kobj_to_dev(kobj); |
ee79a8f8 | 1612 | struct hid_device *hdev = to_hid_device(dev); |
6d3bfb74 AO |
1613 | |
1614 | if (off >= hdev->rsize) | |
1615 | return 0; | |
1616 | ||
1617 | if (off + count > hdev->rsize) | |
1618 | count = hdev->rsize - off; | |
1619 | ||
1620 | memcpy(buf, hdev->rdesc + off, count); | |
1621 | ||
1622 | return count; | |
1623 | } | |
1624 | ||
a877417e OG |
1625 | static ssize_t |
1626 | show_country(struct device *dev, struct device_attribute *attr, | |
1627 | char *buf) | |
1628 | { | |
ee79a8f8 | 1629 | struct hid_device *hdev = to_hid_device(dev); |
a877417e OG |
1630 | |
1631 | return sprintf(buf, "%02x\n", hdev->country & 0xff); | |
1632 | } | |
1633 | ||
6d3bfb74 AO |
1634 | static struct bin_attribute dev_bin_attr_report_desc = { |
1635 | .attr = { .name = "report_descriptor", .mode = 0444 }, | |
1636 | .read = read_report_descriptor, | |
1637 | .size = HID_MAX_DESCRIPTOR_SIZE, | |
1638 | }; | |
1639 | ||
ad8378ed | 1640 | static const struct device_attribute dev_attr_country = { |
a877417e OG |
1641 | .attr = { .name = "country", .mode = 0444 }, |
1642 | .show = show_country, | |
1643 | }; | |
1644 | ||
93c10132 JS |
1645 | int hid_connect(struct hid_device *hdev, unsigned int connect_mask) |
1646 | { | |
1647 | static const char *types[] = { "Device", "Pointer", "Mouse", "Device", | |
1648 | "Joystick", "Gamepad", "Keyboard", "Keypad", | |
1649 | "Multi-Axis Controller" | |
1650 | }; | |
1651 | const char *type, *bus; | |
79b568b9 | 1652 | char buf[64] = ""; |
93c10132 JS |
1653 | unsigned int i; |
1654 | int len; | |
6d3bfb74 | 1655 | int ret; |
93c10132 | 1656 | |
b5e5a37e BN |
1657 | if (hdev->quirks & HID_QUIRK_HIDDEV_FORCE) |
1658 | connect_mask |= (HID_CONNECT_HIDDEV_FORCE | HID_CONNECT_HIDDEV); | |
3a343ee4 DM |
1659 | if (hdev->quirks & HID_QUIRK_HIDINPUT_FORCE) |
1660 | connect_mask |= HID_CONNECT_HIDINPUT_FORCE; | |
93c10132 JS |
1661 | if (hdev->bus != BUS_USB) |
1662 | connect_mask &= ~HID_CONNECT_HIDDEV; | |
0f37cd03 JK |
1663 | if (hid_hiddev(hdev)) |
1664 | connect_mask |= HID_CONNECT_HIDDEV_FORCE; | |
93c10132 JS |
1665 | |
1666 | if ((connect_mask & HID_CONNECT_HIDINPUT) && !hidinput_connect(hdev, | |
1667 | connect_mask & HID_CONNECT_HIDINPUT_FORCE)) | |
1668 | hdev->claimed |= HID_CLAIMED_INPUT; | |
b77c3920 | 1669 | |
93c10132 JS |
1670 | if ((connect_mask & HID_CONNECT_HIDDEV) && hdev->hiddev_connect && |
1671 | !hdev->hiddev_connect(hdev, | |
1672 | connect_mask & HID_CONNECT_HIDDEV_FORCE)) | |
1673 | hdev->claimed |= HID_CLAIMED_HIDDEV; | |
1674 | if ((connect_mask & HID_CONNECT_HIDRAW) && !hidraw_connect(hdev)) | |
1675 | hdev->claimed |= HID_CLAIMED_HIDRAW; | |
1676 | ||
7704ac93 BT |
1677 | if (connect_mask & HID_CONNECT_DRIVER) |
1678 | hdev->claimed |= HID_CLAIMED_DRIVER; | |
1679 | ||
4bc19f62 DH |
1680 | /* Drivers with the ->raw_event callback set are not required to connect |
1681 | * to any other listener. */ | |
1682 | if (!hdev->claimed && !hdev->driver->raw_event) { | |
1683 | hid_err(hdev, "device has no listeners, quitting\n"); | |
93c10132 JS |
1684 | return -ENODEV; |
1685 | } | |
1686 | ||
1687 | if ((hdev->claimed & HID_CLAIMED_INPUT) && | |
1688 | (connect_mask & HID_CONNECT_FF) && hdev->ff_init) | |
1689 | hdev->ff_init(hdev); | |
1690 | ||
1691 | len = 0; | |
1692 | if (hdev->claimed & HID_CLAIMED_INPUT) | |
1693 | len += sprintf(buf + len, "input"); | |
1694 | if (hdev->claimed & HID_CLAIMED_HIDDEV) | |
1695 | len += sprintf(buf + len, "%shiddev%d", len ? "," : "", | |
733aca90 | 1696 | ((struct hiddev *)hdev->hiddev)->minor); |
93c10132 JS |
1697 | if (hdev->claimed & HID_CLAIMED_HIDRAW) |
1698 | len += sprintf(buf + len, "%shidraw%d", len ? "," : "", | |
1699 | ((struct hidraw *)hdev->hidraw)->minor); | |
1700 | ||
1701 | type = "Device"; | |
1702 | for (i = 0; i < hdev->maxcollection; i++) { | |
1703 | struct hid_collection *col = &hdev->collection[i]; | |
1704 | if (col->type == HID_COLLECTION_APPLICATION && | |
1705 | (col->usage & HID_USAGE_PAGE) == HID_UP_GENDESK && | |
1706 | (col->usage & 0xffff) < ARRAY_SIZE(types)) { | |
1707 | type = types[col->usage & 0xffff]; | |
1708 | break; | |
1709 | } | |
1710 | } | |
1711 | ||
1712 | switch (hdev->bus) { | |
1713 | case BUS_USB: | |
1714 | bus = "USB"; | |
1715 | break; | |
1716 | case BUS_BLUETOOTH: | |
1717 | bus = "BLUETOOTH"; | |
1718 | break; | |
06780727 DM |
1719 | case BUS_I2C: |
1720 | bus = "I2C"; | |
1721 | break; | |
93c10132 JS |
1722 | default: |
1723 | bus = "<UNKNOWN>"; | |
1724 | } | |
1725 | ||
a877417e OG |
1726 | ret = device_create_file(&hdev->dev, &dev_attr_country); |
1727 | if (ret) | |
1728 | hid_warn(hdev, | |
1729 | "can't create sysfs country code attribute err: %d\n", ret); | |
1730 | ||
4291ee30 JP |
1731 | hid_info(hdev, "%s: %s HID v%x.%02x %s [%s] on %s\n", |
1732 | buf, bus, hdev->version >> 8, hdev->version & 0xff, | |
1733 | type, hdev->name, hdev->phys); | |
93c10132 JS |
1734 | |
1735 | return 0; | |
1736 | } | |
1737 | EXPORT_SYMBOL_GPL(hid_connect); | |
1738 | ||
c4c259bc JK |
1739 | void hid_disconnect(struct hid_device *hdev) |
1740 | { | |
a877417e | 1741 | device_remove_file(&hdev->dev, &dev_attr_country); |
c4c259bc JK |
1742 | if (hdev->claimed & HID_CLAIMED_INPUT) |
1743 | hidinput_disconnect(hdev); | |
1744 | if (hdev->claimed & HID_CLAIMED_HIDDEV) | |
1745 | hdev->hiddev_disconnect(hdev); | |
1746 | if (hdev->claimed & HID_CLAIMED_HIDRAW) | |
1747 | hidraw_disconnect(hdev); | |
9c5c6ed7 | 1748 | hdev->claimed = 0; |
c4c259bc JK |
1749 | } |
1750 | EXPORT_SYMBOL_GPL(hid_disconnect); | |
1751 | ||
aaac082d DT |
1752 | /** |
1753 | * hid_hw_start - start underlying HW | |
1754 | * @hdev: hid device | |
1755 | * @connect_mask: which outputs to connect, see HID_CONNECT_* | |
1756 | * | |
1757 | * Call this in probe function *after* hid_parse. This will setup HW | |
1758 | * buffers and start the device (if not defeirred to device open). | |
1759 | * hid_hw_stop must be called if this was successful. | |
1760 | */ | |
1761 | int hid_hw_start(struct hid_device *hdev, unsigned int connect_mask) | |
1762 | { | |
1763 | int error; | |
1764 | ||
1765 | error = hdev->ll_driver->start(hdev); | |
1766 | if (error) | |
1767 | return error; | |
1768 | ||
1769 | if (connect_mask) { | |
1770 | error = hid_connect(hdev, connect_mask); | |
1771 | if (error) { | |
1772 | hdev->ll_driver->stop(hdev); | |
1773 | return error; | |
1774 | } | |
1775 | } | |
1776 | ||
1777 | return 0; | |
1778 | } | |
1779 | EXPORT_SYMBOL_GPL(hid_hw_start); | |
1780 | ||
1781 | /** | |
1782 | * hid_hw_stop - stop underlying HW | |
1783 | * @hdev: hid device | |
1784 | * | |
1785 | * This is usually called from remove function or from probe when something | |
1786 | * failed and hid_hw_start was called already. | |
1787 | */ | |
1788 | void hid_hw_stop(struct hid_device *hdev) | |
1789 | { | |
1790 | hid_disconnect(hdev); | |
1791 | hdev->ll_driver->stop(hdev); | |
1792 | } | |
1793 | EXPORT_SYMBOL_GPL(hid_hw_stop); | |
1794 | ||
1795 | /** | |
1796 | * hid_hw_open - signal underlying HW to start delivering events | |
1797 | * @hdev: hid device | |
1798 | * | |
1799 | * Tell underlying HW to start delivering events from the device. | |
1800 | * This function should be called sometime after successful call | |
1801 | * to hid_hiw_start(). | |
1802 | */ | |
1803 | int hid_hw_open(struct hid_device *hdev) | |
1804 | { | |
1805 | int ret; | |
1806 | ||
1807 | ret = mutex_lock_killable(&hdev->ll_open_lock); | |
1808 | if (ret) | |
1809 | return ret; | |
1810 | ||
1811 | if (!hdev->ll_open_count++) { | |
1812 | ret = hdev->ll_driver->open(hdev); | |
1813 | if (ret) | |
1814 | hdev->ll_open_count--; | |
1815 | } | |
1816 | ||
1817 | mutex_unlock(&hdev->ll_open_lock); | |
1818 | return ret; | |
1819 | } | |
1820 | EXPORT_SYMBOL_GPL(hid_hw_open); | |
1821 | ||
1822 | /** | |
1823 | * hid_hw_close - signal underlaying HW to stop delivering events | |
1824 | * | |
1825 | * @hdev: hid device | |
1826 | * | |
1827 | * This function indicates that we are not interested in the events | |
1828 | * from this device anymore. Delivery of events may or may not stop, | |
1829 | * depending on the number of users still outstanding. | |
1830 | */ | |
1831 | void hid_hw_close(struct hid_device *hdev) | |
1832 | { | |
1833 | mutex_lock(&hdev->ll_open_lock); | |
1834 | if (!--hdev->ll_open_count) | |
1835 | hdev->ll_driver->close(hdev); | |
1836 | mutex_unlock(&hdev->ll_open_lock); | |
1837 | } | |
1838 | EXPORT_SYMBOL_GPL(hid_hw_close); | |
1839 | ||
3a6f82f7 JS |
1840 | struct hid_dynid { |
1841 | struct list_head list; | |
1842 | struct hid_device_id id; | |
1843 | }; | |
1844 | ||
1845 | /** | |
1846 | * store_new_id - add a new HID device ID to this driver and re-probe devices | |
1847 | * @driver: target device driver | |
1848 | * @buf: buffer for scanning device ID data | |
1849 | * @count: input size | |
1850 | * | |
1851 | * Adds a new dynamic hid device ID to this driver, | |
1852 | * and causes the driver to probe for all devices again. | |
1853 | */ | |
c2810325 | 1854 | static ssize_t new_id_store(struct device_driver *drv, const char *buf, |
3a6f82f7 JS |
1855 | size_t count) |
1856 | { | |
ba91a967 | 1857 | struct hid_driver *hdrv = to_hid_driver(drv); |
3a6f82f7 JS |
1858 | struct hid_dynid *dynid; |
1859 | __u32 bus, vendor, product; | |
1860 | unsigned long driver_data = 0; | |
1861 | int ret; | |
1862 | ||
1863 | ret = sscanf(buf, "%x %x %x %lx", | |
1864 | &bus, &vendor, &product, &driver_data); | |
1865 | if (ret < 3) | |
1866 | return -EINVAL; | |
1867 | ||
1868 | dynid = kzalloc(sizeof(*dynid), GFP_KERNEL); | |
1869 | if (!dynid) | |
1870 | return -ENOMEM; | |
1871 | ||
1872 | dynid->id.bus = bus; | |
4d53b801 | 1873 | dynid->id.group = HID_GROUP_ANY; |
3a6f82f7 JS |
1874 | dynid->id.vendor = vendor; |
1875 | dynid->id.product = product; | |
1876 | dynid->id.driver_data = driver_data; | |
1877 | ||
1878 | spin_lock(&hdrv->dyn_lock); | |
1879 | list_add_tail(&dynid->list, &hdrv->dyn_list); | |
1880 | spin_unlock(&hdrv->dyn_lock); | |
1881 | ||
cef9bc56 | 1882 | ret = driver_attach(&hdrv->driver); |
3a6f82f7 JS |
1883 | |
1884 | return ret ? : count; | |
1885 | } | |
c2810325 GKH |
1886 | static DRIVER_ATTR_WO(new_id); |
1887 | ||
1888 | static struct attribute *hid_drv_attrs[] = { | |
1889 | &driver_attr_new_id.attr, | |
1890 | NULL, | |
1891 | }; | |
1892 | ATTRIBUTE_GROUPS(hid_drv); | |
3a6f82f7 JS |
1893 | |
1894 | static void hid_free_dynids(struct hid_driver *hdrv) | |
1895 | { | |
1896 | struct hid_dynid *dynid, *n; | |
1897 | ||
1898 | spin_lock(&hdrv->dyn_lock); | |
1899 | list_for_each_entry_safe(dynid, n, &hdrv->dyn_list, list) { | |
1900 | list_del(&dynid->list); | |
1901 | kfree(dynid); | |
1902 | } | |
1903 | spin_unlock(&hdrv->dyn_lock); | |
1904 | } | |
1905 | ||
e04a0442 BT |
1906 | const struct hid_device_id *hid_match_device(struct hid_device *hdev, |
1907 | struct hid_driver *hdrv) | |
3a6f82f7 JS |
1908 | { |
1909 | struct hid_dynid *dynid; | |
1910 | ||
1911 | spin_lock(&hdrv->dyn_lock); | |
1912 | list_for_each_entry(dynid, &hdrv->dyn_list, list) { | |
1913 | if (hid_match_one_id(hdev, &dynid->id)) { | |
1914 | spin_unlock(&hdrv->dyn_lock); | |
1915 | return &dynid->id; | |
1916 | } | |
1917 | } | |
1918 | spin_unlock(&hdrv->dyn_lock); | |
1919 | ||
1920 | return hid_match_id(hdev, hdrv->id_table); | |
1921 | } | |
e04a0442 | 1922 | EXPORT_SYMBOL_GPL(hid_match_device); |
3a6f82f7 | 1923 | |
85cdaf52 JS |
1924 | static int hid_bus_match(struct device *dev, struct device_driver *drv) |
1925 | { | |
ba91a967 | 1926 | struct hid_driver *hdrv = to_hid_driver(drv); |
ee79a8f8 | 1927 | struct hid_device *hdev = to_hid_device(dev); |
85cdaf52 | 1928 | |
070748ed | 1929 | return hid_match_device(hdev, hdrv) != NULL; |
85cdaf52 JS |
1930 | } |
1931 | ||
1932 | static int hid_device_probe(struct device *dev) | |
1933 | { | |
ba91a967 | 1934 | struct hid_driver *hdrv = to_hid_driver(dev->driver); |
ee79a8f8 | 1935 | struct hid_device *hdev = to_hid_device(dev); |
85cdaf52 JS |
1936 | const struct hid_device_id *id; |
1937 | int ret = 0; | |
1938 | ||
c849a614 AR |
1939 | if (down_interruptible(&hdev->driver_input_lock)) { |
1940 | ret = -EINTR; | |
6f68f0ac | 1941 | goto end; |
c849a614 AR |
1942 | } |
1943 | hdev->io_started = false; | |
4ea54542 | 1944 | |
85cdaf52 | 1945 | if (!hdev->driver) { |
3a6f82f7 | 1946 | id = hid_match_device(hdev, hdrv); |
ba623a77 | 1947 | if (id == NULL) { |
4fa3a583 HR |
1948 | ret = -ENODEV; |
1949 | goto unlock; | |
ba623a77 | 1950 | } |
85cdaf52 | 1951 | |
e04a0442 BT |
1952 | if (hdrv->match) { |
1953 | if (!hdrv->match(hdev, hid_ignore_special_drivers)) { | |
1954 | ret = -ENODEV; | |
1955 | goto unlock; | |
1956 | } | |
1957 | } else { | |
1958 | /* | |
1959 | * hid-generic implements .match(), so if | |
1960 | * hid_ignore_special_drivers is set, we can safely | |
1961 | * return. | |
1962 | */ | |
1963 | if (hid_ignore_special_drivers) { | |
1964 | ret = -ENODEV; | |
1965 | goto unlock; | |
1966 | } | |
1967 | } | |
1968 | ||
2904e68f BT |
1969 | /* reset the quirks that has been previously set */ |
1970 | hdev->quirks = hid_lookup_quirk(hdev); | |
c500c971 JS |
1971 | hdev->driver = hdrv; |
1972 | if (hdrv->probe) { | |
1973 | ret = hdrv->probe(hdev, id); | |
1974 | } else { /* default probe */ | |
a7197c2e | 1975 | ret = hid_open_report(hdev); |
c500c971 | 1976 | if (!ret) |
93c10132 | 1977 | ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT); |
85cdaf52 | 1978 | } |
a7197c2e HR |
1979 | if (ret) { |
1980 | hid_close_report(hdev); | |
c500c971 | 1981 | hdev->driver = NULL; |
a7197c2e | 1982 | } |
85cdaf52 | 1983 | } |
ba623a77 | 1984 | unlock: |
c849a614 AR |
1985 | if (!hdev->io_started) |
1986 | up(&hdev->driver_input_lock); | |
6f68f0ac | 1987 | end: |
85cdaf52 JS |
1988 | return ret; |
1989 | } | |
1990 | ||
1991 | static int hid_device_remove(struct device *dev) | |
1992 | { | |
ee79a8f8 | 1993 | struct hid_device *hdev = to_hid_device(dev); |
4ea54542 | 1994 | struct hid_driver *hdrv; |
c849a614 | 1995 | int ret = 0; |
4ea54542 | 1996 | |
c849a614 AR |
1997 | if (down_interruptible(&hdev->driver_input_lock)) { |
1998 | ret = -EINTR; | |
6f68f0ac | 1999 | goto end; |
c849a614 AR |
2000 | } |
2001 | hdev->io_started = false; | |
85cdaf52 | 2002 | |
4ea54542 | 2003 | hdrv = hdev->driver; |
85cdaf52 JS |
2004 | if (hdrv) { |
2005 | if (hdrv->remove) | |
2006 | hdrv->remove(hdev); | |
c500c971 JS |
2007 | else /* default remove */ |
2008 | hid_hw_stop(hdev); | |
a7197c2e | 2009 | hid_close_report(hdev); |
85cdaf52 JS |
2010 | hdev->driver = NULL; |
2011 | } | |
2012 | ||
c849a614 AR |
2013 | if (!hdev->io_started) |
2014 | up(&hdev->driver_input_lock); | |
6f68f0ac | 2015 | end: |
c849a614 | 2016 | return ret; |
85cdaf52 JS |
2017 | } |
2018 | ||
4d53b801 HR |
2019 | static ssize_t modalias_show(struct device *dev, struct device_attribute *a, |
2020 | char *buf) | |
2021 | { | |
2022 | struct hid_device *hdev = container_of(dev, struct hid_device, dev); | |
4d53b801 | 2023 | |
dfa0c5fa RV |
2024 | return scnprintf(buf, PAGE_SIZE, "hid:b%04Xg%04Xv%08Xp%08X\n", |
2025 | hdev->bus, hdev->group, hdev->vendor, hdev->product); | |
4d53b801 | 2026 | } |
0d4260e0 | 2027 | static DEVICE_ATTR_RO(modalias); |
4d53b801 | 2028 | |
0d4260e0 GKH |
2029 | static struct attribute *hid_dev_attrs[] = { |
2030 | &dev_attr_modalias.attr, | |
2031 | NULL, | |
4d53b801 | 2032 | }; |
54f32fd5 AL |
2033 | static struct bin_attribute *hid_dev_bin_attrs[] = { |
2034 | &dev_bin_attr_report_desc, | |
2035 | NULL | |
2036 | }; | |
2037 | static const struct attribute_group hid_dev_group = { | |
2038 | .attrs = hid_dev_attrs, | |
2039 | .bin_attrs = hid_dev_bin_attrs, | |
2040 | }; | |
2041 | __ATTRIBUTE_GROUPS(hid_dev); | |
4d53b801 | 2042 | |
85cdaf52 JS |
2043 | static int hid_uevent(struct device *dev, struct kobj_uevent_env *env) |
2044 | { | |
d193c169 | 2045 | struct hid_device *hdev = to_hid_device(dev); |
85cdaf52 JS |
2046 | |
2047 | if (add_uevent_var(env, "HID_ID=%04X:%08X:%08X", | |
2048 | hdev->bus, hdev->vendor, hdev->product)) | |
2049 | return -ENOMEM; | |
2050 | ||
2051 | if (add_uevent_var(env, "HID_NAME=%s", hdev->name)) | |
2052 | return -ENOMEM; | |
2053 | ||
2054 | if (add_uevent_var(env, "HID_PHYS=%s", hdev->phys)) | |
2055 | return -ENOMEM; | |
2056 | ||
2057 | if (add_uevent_var(env, "HID_UNIQ=%s", hdev->uniq)) | |
2058 | return -ENOMEM; | |
2059 | ||
4d53b801 HR |
2060 | if (add_uevent_var(env, "MODALIAS=hid:b%04Xg%04Xv%08Xp%08X", |
2061 | hdev->bus, hdev->group, hdev->vendor, hdev->product)) | |
85cdaf52 JS |
2062 | return -ENOMEM; |
2063 | ||
2064 | return 0; | |
2065 | } | |
2066 | ||
e04a0442 | 2067 | struct bus_type hid_bus_type = { |
85cdaf52 | 2068 | .name = "hid", |
0d4260e0 | 2069 | .dev_groups = hid_dev_groups, |
c2810325 | 2070 | .drv_groups = hid_drv_groups, |
85cdaf52 JS |
2071 | .match = hid_bus_match, |
2072 | .probe = hid_device_probe, | |
2073 | .remove = hid_device_remove, | |
2074 | .uevent = hid_uevent, | |
2075 | }; | |
d5d3e202 | 2076 | EXPORT_SYMBOL(hid_bus_type); |
d458a9df | 2077 | |
85cdaf52 JS |
2078 | int hid_add_device(struct hid_device *hdev) |
2079 | { | |
2080 | static atomic_t id = ATOMIC_INIT(0); | |
2081 | int ret; | |
2082 | ||
2083 | if (WARN_ON(hdev->status & HID_STAT_ADDED)) | |
2084 | return -EBUSY; | |
2085 | ||
d5d3e202 BT |
2086 | hdev->quirks = hid_lookup_quirk(hdev); |
2087 | ||
d458a9df JS |
2088 | /* we need to kill them here, otherwise they will stay allocated to |
2089 | * wait for coming driver */ | |
4529eefa | 2090 | if (hid_ignore(hdev)) |
d458a9df JS |
2091 | return -ENODEV; |
2092 | ||
3c86726c BT |
2093 | /* |
2094 | * Check for the mandatory transport channel. | |
2095 | */ | |
2096 | if (!hdev->ll_driver->raw_request) { | |
2097 | hid_err(hdev, "transport driver missing .raw_request()\n"); | |
2098 | return -EINVAL; | |
2099 | } | |
2100 | ||
a7197c2e HR |
2101 | /* |
2102 | * Read the device report descriptor once and use as template | |
2103 | * for the driver-specific modifications. | |
2104 | */ | |
2105 | ret = hdev->ll_driver->parse(hdev); | |
2106 | if (ret) | |
2107 | return ret; | |
2108 | if (!hdev->dev_rdesc) | |
2109 | return -ENODEV; | |
2110 | ||
734c6609 HR |
2111 | /* |
2112 | * Scan generic devices for group information | |
2113 | */ | |
4392bf33 BT |
2114 | if (hid_ignore_special_drivers) { |
2115 | hdev->group = HID_GROUP_GENERIC; | |
2116 | } else if (!hdev->group && | |
6e65d9d5 | 2117 | !(hdev->quirks & HID_QUIRK_HAVE_SPECIAL_DRIVER)) { |
734c6609 HR |
2118 | ret = hid_scan_report(hdev); |
2119 | if (ret) | |
2120 | hid_warn(hdev, "bad device descriptor (%d)\n", ret); | |
2121 | } | |
2122 | ||
6bbe586f KS |
2123 | /* XXX hack, any other cleaner solution after the driver core |
2124 | * is converted to allow more than 20 bytes as the device name? */ | |
2125 | dev_set_name(&hdev->dev, "%04X:%04X:%04X.%04X", hdev->bus, | |
2126 | hdev->vendor, hdev->product, atomic_inc_return(&id)); | |
85cdaf52 | 2127 | |
4da361b6 | 2128 | hid_debug_register(hdev, dev_name(&hdev->dev)); |
85cdaf52 JS |
2129 | ret = device_add(&hdev->dev); |
2130 | if (!ret) | |
2131 | hdev->status |= HID_STAT_ADDED; | |
4da361b6 BP |
2132 | else |
2133 | hid_debug_unregister(hdev); | |
a635f9dd | 2134 | |
85cdaf52 JS |
2135 | return ret; |
2136 | } | |
2137 | EXPORT_SYMBOL_GPL(hid_add_device); | |
2138 | ||
2139 | /** | |
2140 | * hid_allocate_device - allocate new hid device descriptor | |
2141 | * | |
2142 | * Allocate and initialize hid device, so that hid_destroy_device might be | |
2143 | * used to free it. | |
2144 | * | |
2145 | * New hid_device pointer is returned on success, otherwise ERR_PTR encoded | |
2146 | * error value. | |
2147 | */ | |
2148 | struct hid_device *hid_allocate_device(void) | |
2149 | { | |
2150 | struct hid_device *hdev; | |
85cdaf52 JS |
2151 | int ret = -ENOMEM; |
2152 | ||
2153 | hdev = kzalloc(sizeof(*hdev), GFP_KERNEL); | |
2154 | if (hdev == NULL) | |
2155 | return ERR_PTR(ret); | |
2156 | ||
2157 | device_initialize(&hdev->dev); | |
2158 | hdev->dev.release = hid_device_release; | |
2159 | hdev->dev.bus = &hid_bus_type; | |
64bebefc | 2160 | device_enable_async_suspend(&hdev->dev); |
85cdaf52 | 2161 | |
a7197c2e | 2162 | hid_close_report(hdev); |
85cdaf52 | 2163 | |
cd667ce2 JK |
2164 | init_waitqueue_head(&hdev->debug_wait); |
2165 | INIT_LIST_HEAD(&hdev->debug_list); | |
1deb9d34 | 2166 | spin_lock_init(&hdev->debug_list_lock); |
c849a614 | 2167 | sema_init(&hdev->driver_input_lock, 1); |
aaac082d | 2168 | mutex_init(&hdev->ll_open_lock); |
cd667ce2 | 2169 | |
85cdaf52 | 2170 | return hdev; |
85cdaf52 JS |
2171 | } |
2172 | EXPORT_SYMBOL_GPL(hid_allocate_device); | |
2173 | ||
2174 | static void hid_remove_device(struct hid_device *hdev) | |
2175 | { | |
2176 | if (hdev->status & HID_STAT_ADDED) { | |
2177 | device_del(&hdev->dev); | |
a635f9dd | 2178 | hid_debug_unregister(hdev); |
85cdaf52 JS |
2179 | hdev->status &= ~HID_STAT_ADDED; |
2180 | } | |
a7197c2e HR |
2181 | kfree(hdev->dev_rdesc); |
2182 | hdev->dev_rdesc = NULL; | |
2183 | hdev->dev_rsize = 0; | |
85cdaf52 JS |
2184 | } |
2185 | ||
2186 | /** | |
2187 | * hid_destroy_device - free previously allocated device | |
2188 | * | |
2189 | * @hdev: hid device | |
2190 | * | |
2191 | * If you allocate hid_device through hid_allocate_device, you should ever | |
2192 | * free by this function. | |
2193 | */ | |
2194 | void hid_destroy_device(struct hid_device *hdev) | |
2195 | { | |
2196 | hid_remove_device(hdev); | |
2197 | put_device(&hdev->dev); | |
2198 | } | |
2199 | EXPORT_SYMBOL_GPL(hid_destroy_device); | |
2200 | ||
e04a0442 | 2201 | |
c17a7476 | 2202 | static int __hid_bus_reprobe_drivers(struct device *dev, void *data) |
e04a0442 | 2203 | { |
c17a7476 BT |
2204 | struct hid_driver *hdrv = data; |
2205 | struct hid_device *hdev = to_hid_device(dev); | |
e04a0442 | 2206 | |
c17a7476 BT |
2207 | if (hdev->driver == hdrv && |
2208 | !hdrv->match(hdev, hid_ignore_special_drivers)) | |
2209 | return device_reprobe(dev); | |
e04a0442 BT |
2210 | |
2211 | return 0; | |
2212 | } | |
2213 | ||
c17a7476 | 2214 | static int __hid_bus_driver_added(struct device_driver *drv, void *data) |
e04a0442 | 2215 | { |
e04a0442 BT |
2216 | struct hid_driver *hdrv = to_hid_driver(drv); |
2217 | ||
c17a7476 BT |
2218 | if (hdrv->match) { |
2219 | bus_for_each_dev(&hid_bus_type, NULL, hdrv, | |
2220 | __hid_bus_reprobe_drivers); | |
2221 | } | |
e04a0442 BT |
2222 | |
2223 | return 0; | |
2224 | } | |
2225 | ||
c17a7476 BT |
2226 | static int __bus_removed_driver(struct device_driver *drv, void *data) |
2227 | { | |
2228 | return bus_rescan_devices(&hid_bus_type); | |
2229 | } | |
2230 | ||
85cdaf52 JS |
2231 | int __hid_register_driver(struct hid_driver *hdrv, struct module *owner, |
2232 | const char *mod_name) | |
2233 | { | |
c17a7476 BT |
2234 | int ret; |
2235 | ||
85cdaf52 JS |
2236 | hdrv->driver.name = hdrv->name; |
2237 | hdrv->driver.bus = &hid_bus_type; | |
2238 | hdrv->driver.owner = owner; | |
2239 | hdrv->driver.mod_name = mod_name; | |
2240 | ||
3a6f82f7 JS |
2241 | INIT_LIST_HEAD(&hdrv->dyn_list); |
2242 | spin_lock_init(&hdrv->dyn_lock); | |
2243 | ||
c17a7476 BT |
2244 | ret = driver_register(&hdrv->driver); |
2245 | ||
2246 | if (ret == 0) | |
2247 | bus_for_each_drv(&hid_bus_type, NULL, NULL, | |
2248 | __hid_bus_driver_added); | |
e04a0442 | 2249 | |
c17a7476 | 2250 | return ret; |
85cdaf52 JS |
2251 | } |
2252 | EXPORT_SYMBOL_GPL(__hid_register_driver); | |
2253 | ||
2254 | void hid_unregister_driver(struct hid_driver *hdrv) | |
2255 | { | |
2256 | driver_unregister(&hdrv->driver); | |
3a6f82f7 | 2257 | hid_free_dynids(hdrv); |
e04a0442 BT |
2258 | |
2259 | bus_for_each_drv(&hid_bus_type, NULL, hdrv, __bus_removed_driver); | |
85cdaf52 JS |
2260 | } |
2261 | EXPORT_SYMBOL_GPL(hid_unregister_driver); | |
2262 | ||
0361a28d ON |
2263 | int hid_check_keys_pressed(struct hid_device *hid) |
2264 | { | |
2265 | struct hid_input *hidinput; | |
2266 | int i; | |
2267 | ||
e5288eb5 JK |
2268 | if (!(hid->claimed & HID_CLAIMED_INPUT)) |
2269 | return 0; | |
2270 | ||
0361a28d ON |
2271 | list_for_each_entry(hidinput, &hid->inputs, list) { |
2272 | for (i = 0; i < BITS_TO_LONGS(KEY_MAX); i++) | |
2273 | if (hidinput->input->key[i]) | |
2274 | return 1; | |
2275 | } | |
2276 | ||
2277 | return 0; | |
2278 | } | |
2279 | ||
2280 | EXPORT_SYMBOL_GPL(hid_check_keys_pressed); | |
2281 | ||
86166b7b JK |
2282 | static int __init hid_init(void) |
2283 | { | |
85cdaf52 JS |
2284 | int ret; |
2285 | ||
a635f9dd | 2286 | if (hid_debug) |
4291ee30 JP |
2287 | pr_warn("hid_debug is now used solely for parser and driver debugging.\n" |
2288 | "debugfs is now used for inspecting the device (report descriptor, reports)\n"); | |
a635f9dd | 2289 | |
85cdaf52 JS |
2290 | ret = bus_register(&hid_bus_type); |
2291 | if (ret) { | |
4291ee30 | 2292 | pr_err("can't register hid bus\n"); |
85cdaf52 JS |
2293 | goto err; |
2294 | } | |
2295 | ||
2296 | ret = hidraw_init(); | |
2297 | if (ret) | |
2298 | goto err_bus; | |
2299 | ||
a635f9dd JK |
2300 | hid_debug_init(); |
2301 | ||
85cdaf52 JS |
2302 | return 0; |
2303 | err_bus: | |
2304 | bus_unregister(&hid_bus_type); | |
2305 | err: | |
2306 | return ret; | |
86166b7b JK |
2307 | } |
2308 | ||
2309 | static void __exit hid_exit(void) | |
2310 | { | |
a635f9dd | 2311 | hid_debug_exit(); |
86166b7b | 2312 | hidraw_exit(); |
85cdaf52 | 2313 | bus_unregister(&hid_bus_type); |
d5d3e202 | 2314 | hid_quirks_exit(HID_BUS_ANY); |
86166b7b JK |
2315 | } |
2316 | ||
2317 | module_init(hid_init); | |
2318 | module_exit(hid_exit); | |
2319 | ||
88adb72b JK |
2320 | MODULE_AUTHOR("Andreas Gal"); |
2321 | MODULE_AUTHOR("Vojtech Pavlik"); | |
2322 | MODULE_AUTHOR("Jiri Kosina"); | |
7021b600 | 2323 | MODULE_LICENSE("GPL"); |